diff --git a/backend/live_executor.py b/backend/live_executor.py
index cb614ff..42db7f1 100644
--- a/backend/live_executor.py
+++ b/backend/live_executor.py
@@ -263,7 +263,17 @@ async def execute_entry(session: aiohttp.ClientSession, signal: dict, db_conn):
 
     t_signal = signal_ts  # 信号时间戳(ms)
 
-    # 0. 检查风控状态（读risk_guard写的状态文件）
+    # 0. 信号新鲜度检查（超过2秒弃仓）
+    SIGNAL_MAX_AGE_MS = 2000
+    signal_age_ms = time.time() * 1000 - t_signal
+    if signal_age_ms > SIGNAL_MAX_AGE_MS:
+        logger.warning(f"[{symbol}] ❌ 信号过期: {signal_age_ms:.0f}ms > {SIGNAL_MAX_AGE_MS}ms，弃仓")
+        _log_event(db_conn, "warn", "trade",
+                   f"信号过期弃仓 {direction} {symbol} | age={signal_age_ms:.0f}ms | score={score}",
+                   symbol, {"signal_age_ms": round(signal_age_ms), "score": score})
+        return None
+
+    # 0.5 检查风控状态（读risk_guard写的状态文件）
     try:
         with open("/tmp/risk_guard_state.json") as f:
             risk_state = json.load(f)