diff --git a/monitor.py b/monitor.py
index e8bde35..8398c6b 100644
--- a/monitor.py
+++ b/monitor.py
@@ -5269,12 +5269,12 @@ class MessageMonitor:
                 self._last_screenshot_hash.pop(platform, None)
                 self._last_new_msg_time[platform] = time.time()
             else:
+                # ⭐ 清理OCR噪声前缀（如"必选，"）后再搜索知识库
+                cleaned_item = self._clean_ocr_prefix(item)
                 self._last_new_msg_time[platform] = time.time()
                 self._last_msg[platform] = cleaned_item
                 engine_tag = self._last_chosen_engine.get(platform, "")
                 logger.info(f"[{platform}] 新消息[{engine_tag}]: {item[:60]}")
-                # ⭐ 清理OCR噪声前缀（如"必选，"）后再搜索知识库
-                cleaned_item = self._clean_ocr_prefix(item)
                 # ⚠️ 急停检查：回复前最后检查，防止急停后仍然发送
                 if not self._running:
                     return