diff --git a/deploy/single-node/systemd/pangolin-agent.service b/deploy/single-node/systemd/pangolin-agent.service
index 5ce9add..f24fe38 100644
--- a/deploy/single-node/systemd/pangolin-agent.service
+++ b/deploy/single-node/systemd/pangolin-agent.service
@@ -12,6 +12,10 @@ StartLimitIntervalSec=0
 Type=simple
 EnvironmentFile=/etc/pangolin-agent/agent.env
 ExecStart=/usr/local/bin/pangolin-agent
+# SIGHUP → agent 重读节点本地配置(acl.json/warp.json)并热重渲染,不冷启动
+# sing-box、不踢在线用户。没有这行,`systemctl reload` 会报「Job type reload is
+# not applicable」,运维只能退回 restart(整进程重启,sing-box 冷启动瞬断全员)。
+ExecReload=/bin/kill -HUP $MAINPID
 # 始终自愈(崩溃/被依赖停后都拉起);RestartSec 做退避。
 Restart=always
 RestartSec=5