diff --git a/src/app/play/page.tsx b/src/app/play/page.tsx
index f1bbbec..11b7327 100644
--- a/src/app/play/page.tsx
+++ b/src/app/play/page.tsx
@@ -9,6 +9,7 @@ import { Suspense, useEffect, useRef, useState } from 'react';
 import { getAuthInfoFromBrowserCookie } from '@/lib/auth';
 import {
   convertDanmakuFormat,
+  clearDanmakuCacheByTitle,
   getDanmakuById,
   getDanmakuFromCache,
   getEpisodes,
@@ -4255,6 +4256,17 @@ function PlayPageClient() {
       // 尝试跳转到当前正在播放的集数
       let targetIndex = currentEpisodeIndex;
 
+      // 如果新源的集数跟旧源的集数不一致，清除当前剧集的所有弹幕缓存
+      const oldEpisodeCount = detail?.episodes?.length || 0;
+      const newEpisodeCount = newDetail.episodes?.length || 0;
+      if (oldEpisodeCount > 0 && newEpisodeCount > 0 && oldEpisodeCount !== newEpisodeCount) {
+        const titleForCache = detail?.title || videoTitle;
+        console.log(`换源集数不一致 (${oldEpisodeCount} -> ${newEpisodeCount})，清除弹幕缓存: ${titleForCache}`);
+        clearDanmakuCacheByTitle(titleForCache).catch((err) => {
+          console.error('清除弹幕缓存失败:', err);
+        });
+      }
+
       // 如果当前集数超出新源的范围，则跳转到第一集
       if (!newDetail.episodes || targetIndex >= newDetail.episodes.length) {
         targetIndex = 0;
diff --git a/src/lib/danmaku/api.ts b/src/lib/danmaku/api.ts
index 78c1e64..1f59270 100644
--- a/src/lib/danmaku/api.ts
+++ b/src/lib/danmaku/api.ts
@@ -2,6 +2,7 @@
 import {
   clearAllDanmakuCache,
   clearDanmakuCache,
+  clearDanmakuCacheByTitle,
   clearExpiredDanmakuCache,
   generateCacheKey,
   getDanmakuCacheStats,
@@ -43,6 +44,7 @@ export function initDanmakuModule(): void {
 export {
   clearAllDanmakuCache,
   clearDanmakuCache,
+  clearDanmakuCacheByTitle,
   clearExpiredDanmakuCache,
   generateCacheKey,
   getDanmakuCacheStats,
diff --git a/src/lib/danmaku/cache.ts b/src/lib/danmaku/cache.ts
index 928ab51..b36c2b9 100644
--- a/src/lib/danmaku/cache.ts
+++ b/src/lib/danmaku/cache.ts
@@ -276,6 +276,51 @@ export async function clearDanmakuCache(title: string, episodeIndex: number): Pr
   }
 }
 
+// 清除指定标题的所有弹幕缓存（所有集数）
+export async function clearDanmakuCacheByTitle(title: string): Promise<number> {
+  try {
+    const db = await openDB();
+    const transaction = db.transaction([STORE_NAME], 'readwrite');
+    const objectStore = transaction.objectStore(STORE_NAME);
+
+    return new Promise((resolve, reject) => {
+      const request = objectStore.openCursor();
+      let deletedCount = 0;
+
+      request.onsuccess = (event) => {
+        const cursor = (event.target as IDBRequest<IDBCursorWithValue>).result;
+
+        if (cursor) {
+          const data = cursor.value as DanmakuCacheData;
+
+          if (data.title === title) {
+            cursor.delete();
+            deletedCount++;
+          }
+
+          cursor.continue();
+        } else {
+          if (deletedCount > 0) {
+            console.log(`已清除标题"${title}"的 ${deletedCount} 个弹幕缓存`);
+          }
+          resolve(deletedCount);
+        }
+      };
+
+      request.onerror = () => {
+        reject(new Error('清除弹幕缓存失败'));
+      };
+
+      transaction.oncomplete = () => {
+        db.close();
+      };
+    });
+  } catch (error) {
+    console.error('清除弹幕缓存失败:', error);
+    return 0;
+  }
+}
+
 // 清除所有过期缓存
 export async function clearExpiredDanmakuCache(): Promise<number> {
   try {