diff --git a/src/App.tsx b/src/App.tsx
index 8bd03438..05c01e1b 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -4,6 +4,7 @@ import {
   flushConfig,
   flushSaveConfig,
   type DownloadProgress,
+  type UpdateInfo,
 } from '@/stores/appStore';
 import {
   TitleBar,
@@ -89,7 +90,12 @@ import { WebUIBetaBanner } from './components/app/WebUIBetaBanner';
 import { startGlobalCallbackListener } from './components/connection/callbackCache';
 import { useIsMobile } from '@/hooks/useIsMobile';
 import { ScrollText } from 'lucide-react';
-import { defaultConfig, defaultWindowSize, isValidMxuConfig } from '@/types/config';
+import {
+  defaultConfig,
+  defaultScheduledUpdateCheckTime,
+  defaultWindowSize,
+  isValidMxuConfig,
+} from '@/types/config';
 
 const log = loggers.app;
 
@@ -208,6 +214,8 @@ function App() {
     onboardingCompleted,
     backgroundImage,
     backgroundOpacity,
+    scheduledUpdateCheckEnabled,
+    scheduledUpdateCheckTime,
   } = useAppStore(
     useShallow((state) => ({
       setProjectInterface: state.setProjectInterface,
@@ -250,6 +258,8 @@ function App() {
       onboardingCompleted: state.onboardingCompleted,
       backgroundImage: state.backgroundImage,
       backgroundOpacity: state.backgroundOpacity,
+      scheduledUpdateCheckEnabled: state.scheduledUpdateCheckEnabled,
+      scheduledUpdateCheckTime: state.scheduledUpdateCheckTime,
     })),
   );
 
@@ -509,6 +519,120 @@ function App() {
     [setDownloadStatus, setDownloadProgress, setDownloadSavePath, tryAutoInstallUpdate],
   );
 
+  // 启动检查和定时检查共用更新结果处理
+  const handleAutoUpdateCheckResult = useCallback(
+    (updateResult: UpdateInfo) => {
+      setUpdateInfo(updateResult);
+      if (updateResult.hasUpdate) {
+        log.info(`发现新版本: ${updateResult.versionName}`);
+        useAppStore.getState().setShowUpdateDialog(true);
+        if (updateResult.downloadUrl) {
+          startAutoDownload(updateResult);
+        }
+      } else if (updateResult.errorCode) {
+        log.warn(`更新检查返回错误: code=${updateResult.errorCode}`);
+        useAppStore.getState().setShowUpdateDialog(true);
+      }
+    },
+    [setUpdateInfo, startAutoDownload],
+  );
+
+  // 仅桌面端负责定时更新，避免多个 WebUI 页面重复触发
+  useEffect(() => {
+    if (
+      !scheduledUpdateCheckEnabled ||
+      loadingState !== 'success' ||
+      !isTauri() ||
+      import.meta.env.DEV
+    ) {
+      return;
+    }
+    if (
+      !projectInterface?.mirrorchyan_rid ||
+      !projectInterface.version ||
+      isDebugVersion(projectInterface.version)
+    ) {
+      return;
+    }
+
+    const { mirrorchyan_rid: resourceId, version: currentVersion, github, name } = projectInterface;
+    let cancelled = false;
+    const isUpdateBusy = () => {
+      const state = useAppStore.getState();
+      return (
+        state.downloadStatus === 'downloading' ||
+        state.downloadStatus === 'completed' ||
+        state.installStatus !== 'idle'
+      );
+    };
+
+    const checkForScheduledUpdate = async () => {
+      const state = useAppStore.getState();
+      if (state.updateCheckLoading || isUpdateBusy()) return;
+      state.setUpdateCheckLoading(true);
+      const { mirrorChyanSettings, proxySettings } = state;
+      try {
+        log.info('定时检查更新');
+        const updateResult = await checkAndPrepareDownload({
+          resourceId,
+          currentVersion,
+          cdk: mirrorChyanSettings.cdk || undefined,
+          channel: mirrorChyanSettings.channel,
+          userAgent: 'MXU',
+          githubUrl: github,
+          githubPat: mirrorChyanSettings.githubPat || undefined,
+          proxyUrl: proxySettings?.url,
+          projectName: name,
+        });
+        const current = useAppStore.getState();
+        // 只在检查参数或更新状态变化时丢弃结果，不比较配置对象引用
+        if (
+          cancelled ||
+          isUpdateBusy() ||
+          current.mirrorChyanSettings.cdk !== mirrorChyanSettings.cdk ||
+          current.mirrorChyanSettings.channel !== mirrorChyanSettings.channel ||
+          current.mirrorChyanSettings.githubPat !== mirrorChyanSettings.githubPat ||
+          current.proxySettings?.url !== proxySettings?.url
+        ) {
+          return;
+        }
+        if (updateResult) handleAutoUpdateCheckResult(updateResult);
+      } catch (err) {
+        log.warn('定时检查更新失败:', err);
+      } finally {
+        state.setUpdateCheckLoading(false);
+      }
+    };
+
+    const [hour, minute] = scheduledUpdateCheckTime.split(':').map(Number);
+    let timer: ReturnType<typeof setTimeout>;
+    const scheduleNextCheck = () => {
+      const now = new Date();
+      const nextCheck = new Date(now);
+      nextCheck.setHours(hour, minute, 0, 0);
+      if (nextCheck.getTime() <= now.getTime()) {
+        nextCheck.setDate(nextCheck.getDate() + 1);
+      }
+
+      timer = setTimeout(() => {
+        void checkForScheduledUpdate();
+        scheduleNextCheck();
+      }, nextCheck.getTime() - now.getTime());
+    };
+
+    scheduleNextCheck();
+    return () => {
+      cancelled = true;
+      clearTimeout(timer);
+    };
+  }, [
+    loadingState,
+    projectInterface,
+    scheduledUpdateCheckEnabled,
+    scheduledUpdateCheckTime,
+    handleAutoUpdateCheckResult,
+  ]);
+
   // 设置窗口标题（根据 ProjectInterface V2 协议）
   useEffect(() => {
     if (!projectInterface) return;
@@ -648,6 +772,13 @@ function App() {
       // 应用配置
       if (config.instances.length > 0) {
         importConfig(config);
+      } else {
+        // 无实例时单独恢复定时检查偏好
+        const state = useAppStore.getState();
+        state.setScheduledUpdateCheckEnabled(config.settings.scheduledUpdateCheckEnabled === true);
+        state.setScheduledUpdateCheckTime(
+          config.settings.scheduledUpdateCheckTime ?? defaultScheduledUpdateCheckTime,
+        );
       }
 
       // 初始化匿名遥测（仅当 interface 声明了 telemetry.sentry.dsn 且非调试 / 开发版本）
@@ -1075,17 +1206,7 @@ function App() {
               projectName: result.interface.name,
             });
             if (updateResult) {
-              setUpdateInfo(updateResult);
-              if (updateResult.hasUpdate) {
-                log.info(`发现新版本: ${updateResult.versionName}`);
-                useAppStore.getState().setShowUpdateDialog(true);
-                if (updateResult.downloadUrl) {
-                  startAutoDownload(updateResult);
-                }
-              } else if (updateResult.errorCode) {
-                log.warn(`更新检查返回错误: code=${updateResult.errorCode}`);
-                useAppStore.getState().setShowUpdateDialog(true);
-              }
+              handleAutoUpdateCheckResult(updateResult);
             }
           } catch (err) {
             log.warn('自动检查更新失败:', err);
diff --git a/src/components/settings/UpdateSection.tsx b/src/components/settings/UpdateSection.tsx
index bd9aaf3e..6fbde039 100644
--- a/src/components/settings/UpdateSection.tsx
+++ b/src/components/settings/UpdateSection.tsx
@@ -13,6 +13,7 @@ import {
   PackageCheck,
   Bug,
   Network,
+  Clock,
 } from 'lucide-react';
 import clsx from 'clsx';
 
@@ -30,6 +31,7 @@ import { createProxySettings, proxySettingsForUpdateDownload } from '@/services/
 import { resolveI18nText } from '@/services/contentResolver';
 import { getInterfaceLangKey } from '@/i18n';
 import { loggers } from '@/utils/logger';
+import { SwitchButton, TimeInput } from '../FormControls';
 import { ReleaseNotes, DownloadProgressBar } from '../UpdateInfoCard';
 
 export function UpdateSection() {
@@ -42,6 +44,10 @@ export function UpdateSection() {
     mirrorChyanSettings,
     setMirrorChyanCdk,
     setMirrorChyanChannel,
+    scheduledUpdateCheckEnabled,
+    scheduledUpdateCheckTime,
+    setScheduledUpdateCheckEnabled,
+    setScheduledUpdateCheckTime,
     proxySettings,
     setProxySettings,
     updateInfo,
@@ -200,7 +206,7 @@ export function UpdateSection() {
           isPendingGitHubDownload ||
           noUpdateInfoYet);
 
-      if (shouldTryMirrorChyan) {
+      if (shouldTryMirrorChyan && !useAppStore.getState().updateCheckLoading) {
         if (isDownloadingFromGitHub) {
           addDebugLog('检测到填入 CDK，正在停止 GitHub 下载并切换到 Mirror酱...');
           await cancelDownload();
@@ -309,6 +315,7 @@ export function UpdateSection() {
 
   // 检查更新
   const handleCheckUpdate = async () => {
+    if (useAppStore.getState().updateCheckLoading) return;
     if (!projectInterface?.mirrorchyan_rid || !projectInterface?.version) {
       addDebugLog('未配置 mirrorchyan_rid 或 version，无法检查更新');
       return;
@@ -415,6 +422,33 @@ export function UpdateSection() {
               </div>
             </div>
 
+            {/* 定时检查更新 */}
+            <div className="pt-4 border-t border-border space-y-3">
+              <div className="flex items-center justify-between gap-3">
+                <div className="flex items-center gap-3">
+                  <Clock className="w-5 h-5 text-accent" />
+                  <span className="font-medium text-text-primary">
+                    {t('settings.scheduledUpdateCheck')}
+                  </span>
+                </div>
+                <SwitchButton
+                  value={scheduledUpdateCheckEnabled}
+                  onChange={setScheduledUpdateCheckEnabled}
+                />
+              </div>
+              {scheduledUpdateCheckEnabled && (
+                <label className="flex items-center justify-between gap-3">
+                  <span className="text-sm text-text-secondary">
+                    {t('settings.scheduledUpdateCheckTime')}
+                  </span>
+                  <TimeInput
+                    value={scheduledUpdateCheckTime}
+                    onChange={setScheduledUpdateCheckTime}
+                  />
+                </label>
+              )}
+            </div>
+
             {/* CDK 输入 */}
             <div className="pt-4 border-t border-border">
               <div className="flex items-center gap-3 mb-3">
diff --git a/src/i18n/locales/en-US.ts b/src/i18n/locales/en-US.ts
index dd052f03..3bec2f56 100644
--- a/src/i18n/locales/en-US.ts
+++ b/src/i18n/locales/en-US.ts
@@ -50,6 +50,8 @@ export default {
     appearance: 'Appearance',
     hotkeys: 'Hotkeys',
     general: 'General',
+    scheduledUpdateCheck: 'Scheduled Update Checks',
+    scheduledUpdateCheckTime: 'Daily Check Time (Local Time)',
     taskSettings: 'Task Settings',
     taskSettingsEmpty: 'No settings available to display',
     language: 'Language',
diff --git a/src/i18n/locales/ja-JP.ts b/src/i18n/locales/ja-JP.ts
index 52e6a68e..1a7d8aa9 100644
--- a/src/i18n/locales/ja-JP.ts
+++ b/src/i18n/locales/ja-JP.ts
@@ -49,6 +49,8 @@ export default {
     appearance: '外観',
     hotkeys: 'ショートカットキー',
     general: '一般',
+    scheduledUpdateCheck: '更新の定時確認',
+    scheduledUpdateCheckTime: '毎日の確認時刻（現地時間）',
     taskSettings: 'タスク設定',
     taskSettingsEmpty: '表示できる設定項目がありません',
     language: '言語',
diff --git a/src/i18n/locales/ko-KR.ts b/src/i18n/locales/ko-KR.ts
index 04917402..f43170b1 100644
--- a/src/i18n/locales/ko-KR.ts
+++ b/src/i18n/locales/ko-KR.ts
@@ -49,6 +49,8 @@ export default {
     appearance: '외관',
     hotkeys: '단축키',
     general: '일반',
+    scheduledUpdateCheck: '예약 업데이트 확인',
+    scheduledUpdateCheckTime: '매일 확인 시간 (현지 시간)',
     taskSettings: '작업 설정',
     taskSettingsEmpty: '표시할 수 있는 설정 항목이 없습니다',
     language: '언어',
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index cdbca16a..a844e6be 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -50,6 +50,8 @@ export default {
     appearance: '外观',
     hotkeys: '快捷键',
     general: '通用',
+    scheduledUpdateCheck: '定时检查更新',
+    scheduledUpdateCheckTime: '每日检查时间（本地时间）',
     taskSettings: '任务设置',
     taskSettingsEmpty: '当前没有可显示的设置项',
     language: '语言',
diff --git a/src/i18n/locales/zh-TW.ts b/src/i18n/locales/zh-TW.ts
index fa4098b9..d79420bb 100644
--- a/src/i18n/locales/zh-TW.ts
+++ b/src/i18n/locales/zh-TW.ts
@@ -49,6 +49,8 @@ export default {
     appearance: '外觀',
     hotkeys: '快捷鍵',
     general: '一般',
+    scheduledUpdateCheck: '定時檢查更新',
+    scheduledUpdateCheckTime: '每日檢查時間（本地時間）',
     taskSettings: '任務設定',
     taskSettingsEmpty: '目前沒有可顯示的設定項',
     language: '語言',
diff --git a/src/stores/appStore.ts b/src/stores/appStore.ts
index 7966539d..5a46d9cd 100644
--- a/src/stores/appStore.ts
+++ b/src/stores/appStore.ts
@@ -22,9 +22,11 @@ import {
   DEFAULT_MAX_LOGS_PER_INSTANCE,
   defaultAddTaskPanelHeight,
   defaultMirrorChyanSettings,
+  defaultScheduledUpdateCheckTime,
   defaultScreenshotFrameRate,
   defaultWindowSize,
   normalizeAddTaskPanelHeight,
+  normalizeScheduledUpdateCheckTime,
 } from '@/types/config';
 import type {
   ActionConfig,
@@ -1493,6 +1495,10 @@ export const useAppStore = create<AppState>()(
         confirmBeforeDelete: config.settings.confirmBeforeDelete ?? false,
         maxLogsPerInstance: config.settings.maxLogsPerInstance ?? DEFAULT_MAX_LOGS_PER_INSTANCE,
         autoClearLogsOnLaunch: config.settings.autoClearLogsOnLaunch ?? false,
+        scheduledUpdateCheckEnabled: config.settings.scheduledUpdateCheckEnabled === true,
+        scheduledUpdateCheckTime: normalizeScheduledUpdateCheckTime(
+          config.settings.scheduledUpdateCheckTime,
+        ),
         // 默认开启；调试 / 开发版本强制关闭
         helpImproveSoftware: isTelemetryBlockedByBuild(get().projectInterface)
           ? false
@@ -2013,6 +2019,13 @@ export const useAppStore = create<AppState>()(
         mirrorChyanSettings: { ...state.mirrorChyanSettings, channel },
       })),
 
+    // 定时检查更新
+    scheduledUpdateCheckEnabled: false,
+    scheduledUpdateCheckTime: defaultScheduledUpdateCheckTime,
+    setScheduledUpdateCheckEnabled: (enabled) => set({ scheduledUpdateCheckEnabled: enabled }),
+    setScheduledUpdateCheckTime: (time) =>
+      set({ scheduledUpdateCheckTime: normalizeScheduledUpdateCheckTime(time) }),
+
     // 代理设置
     proxySettings: undefined,
     setProxySettings: (settings) => set({ proxySettings: settings }),
@@ -2482,6 +2495,8 @@ function generateConfig(): MxuConfig {
           confirmBeforeDelete: state.confirmBeforeDelete,
           maxLogsPerInstance: state.maxLogsPerInstance,
           autoClearLogsOnLaunch: state.autoClearLogsOnLaunch,
+          scheduledUpdateCheckEnabled: state.scheduledUpdateCheckEnabled,
+          scheduledUpdateCheckTime: state.scheduledUpdateCheckTime,
           helpImproveSoftware: state.helpImproveSoftware,
           windowSize: bl?.windowSize ?? state.windowSize,
           windowPosition: bl?.windowPosition ?? state.windowPosition,
@@ -2577,6 +2592,8 @@ useAppStore.subscribe(
     autoClearLogsOnLaunch: state.autoClearLogsOnLaunch,
     helpImproveSoftware: state.helpImproveSoftware,
     mirrorChyanSettings: state.mirrorChyanSettings,
+    scheduledUpdateCheckEnabled: state.scheduledUpdateCheckEnabled,
+    scheduledUpdateCheckTime: state.scheduledUpdateCheckTime,
     proxySettings: state.proxySettings,
     welcomeShownHash: state.welcomeShownHash,
     devMode: state.devMode,
diff --git a/src/stores/types.ts b/src/stores/types.ts
index 6ba8cf33..dfc4ed73 100644
--- a/src/stores/types.ts
+++ b/src/stores/types.ts
@@ -374,6 +374,12 @@ export interface AppState {
   setMirrorChyanCdk: (cdk: string) => void;
   setMirrorChyanChannel: (channel: UpdateChannel) => void;
 
+  // 定时检查更新
+  scheduledUpdateCheckEnabled: boolean;
+  scheduledUpdateCheckTime: string;
+  setScheduledUpdateCheckEnabled: (enabled: boolean) => void;
+  setScheduledUpdateCheckTime: (time: string) => void;
+
   // 代理设置
   proxySettings: ProxySettings | undefined;
   setProxySettings: (settings: ProxySettings | undefined) => void;
diff --git a/src/types/config.ts b/src/types/config.ts
index 0931274b..71211a6f 100644
--- a/src/types/config.ts
+++ b/src/types/config.ts
@@ -144,6 +144,8 @@ export interface AppSettings {
   /** 每个实例最多保留的日志条数（超出自动丢弃最旧的） */
   maxLogsPerInstance?: number;
   autoClearLogsOnLaunch?: boolean;
+  scheduledUpdateCheckEnabled?: boolean; // 是否每天定时检查更新，默认关闭
+  scheduledUpdateCheckTime?: string; // 每天检查更新的本地时间（HH:mm），默认 08:00
   windowSize?: WindowSize;
   windowPosition?: WindowPosition; // 窗口位置
   mirrorChyan?: MirrorChyanSettings;
@@ -198,6 +200,14 @@ export const defaultWindowSize: WindowSize = {
   height: 618,
 };
 
+export const defaultScheduledUpdateCheckTime = '08:00';
+
+export function normalizeScheduledUpdateCheckTime(value: unknown): string {
+  return typeof value === 'string' && /^([01]\d|2[0-3]):[0-5]\d$/.test(value)
+    ? value
+    : defaultScheduledUpdateCheckTime;
+}
+
 // 默认 MirrorChyan 设置
 export const defaultMirrorChyanSettings: MirrorChyanSettings = {
   cdk: '',
@@ -244,6 +254,8 @@ export const defaultConfig: MxuConfig = {
     confirmBeforeDelete: false,
     maxLogsPerInstance: DEFAULT_MAX_LOGS_PER_INSTANCE,
     autoClearLogsOnLaunch: false,
+    scheduledUpdateCheckEnabled: false,
+    scheduledUpdateCheckTime: defaultScheduledUpdateCheckTime,
     windowSize: defaultWindowSize,
     mirrorChyan: defaultMirrorChyanSettings,
     helpImproveSoftware: true,