A safe device in locomotive electronic system includes sink and remote end connected by wireless transmission pact. When the locomotive electron device is closed and remmote end can't connect to sinkat the first time, the remote end starts the caution module attached to remote end. When it is opened and the sink can't connect to remote end at the first time, the system will lock up the use. The remote end has a control key, it can stop the safe device and carries on wireless transmission, it makes the remote end and sink all can't send wireless signal.