diff --git a/WebSocket/backend_singleton.py b/WebSocket/backend_singleton.py
index 7a78bd0..f895136 100644
--- a/WebSocket/backend_singleton.py
+++ b/WebSocket/backend_singleton.py
@@ -71,6 +71,10 @@ class WebSocketManager:
     def connect_backend(self, token: str) -> bool:
         """连接后端WebSocket"""
         try:
+            # 🔥 重置清理标记，准备下次重连检测
+            if hasattr(self, '_cleared'):
+                delattr(self, '_cleared')
+            
             # 1 保存token到配置
             try:
                 from config import set_saved_token
@@ -143,6 +147,13 @@ class WebSocketManager:
     def _handle_platform_login(self, platform_name: str, store_id: str, cookies: str):
         """处理平台登录请求"""
         try:
+            # 🔥 检查并清理旧连接（重连后首次登录时）
+            if not hasattr(self, '_cleared') and self.platform_listeners:
+                self._log(f"🔄 检测到后端重连后首次登录，清理 {len(self.platform_listeners)} 个旧连接", "INFO")
+                self.platform_listeners.clear()
+                self.connected_platforms.clear()
+                self._cleared = True
+            
             # 平台名称映射
             platform_map = {
                 "淘宝": "千牛",