diff --git a/deploy/profile-scripts/price_monitor.py b/deploy/profile-scripts/price_monitor.py
index 652e1d9e..b5159d11 100644
--- a/deploy/profile-scripts/price_monitor.py
+++ b/deploy/profile-scripts/price_monitor.py
@@ -407,10 +407,17 @@ def _handle_sigterm(signum, frame):
     _cleanup_lock()
     sys.exit(0)
 
+def _handle_sigalrm(signum, frame):
+    """收到SIGALRM强制超时时清理锁文件后退出"""
+    _cleanup_lock()
+    print(f"[TIMEOUT] 本轮执行超时({signum}s)，已清理锁文件", file=sys.stderr, flush=True)
+    sys.exit(0)
+
 def run_once(round_label=""):
     """执行一轮完整的监控流程"""
     import os, signal  # 必须在开头import，否则os变量会被后面的局部import绑定覆盖
     signal.signal(signal.SIGTERM, _handle_sigterm)
+    signal.signal(signal.SIGALRM, _handle_sigalrm)
     os.nice(10)  # 降低优先级，避免与DB其他写操作抢占
     # ── 进程锁：同一时间只跑一个实例 ──
     _lk = "/tmp/price_monitor.lock"
@@ -425,6 +432,7 @@ def run_once(round_label=""):
         pass
     with open(_lk, "w") as _f:
         _f.write(str(os.getpid()))
+    signal.alarm(120)  # 硬上限120s，超时自动清理锁退出
     
     label = f" [{round_label}]" if round_label else ""
     start = time.time()
@@ -745,6 +753,9 @@ def run_once(round_label=""):
     # 输出耗时
     print(f"⏱{label} {elapsed:.1f}s", flush=True)
 
+    # 取消超时定时器（正常完成）
+    signal.alarm(0)
+
     # 清理进程锁
     try:
         os.remove("/tmp/price_monitor.lock")