The present invention discloses a transformer burglar alarm. The transformer burglar alarm is characterized in that the alarm comprises a safety identification module, a general control module, a signal emission device, an alarm device and a sensing module; the general control module is connected with the other modules; the safety identification module is used for judging if to start the alarm; the sensing module comprises an infrared induction module and a gravity sensing module; a signal lag transmission module is arranged between the signal emission device and the alarm device; and lag time of the signal lag transmission module is set according to experience points. The beneficial effects are that the alarm can timely and quietly send out alarm signals through the signal emission device, thus to notify police strength around of timely arrest. Meanwhile, when time exceeds the time set by the signal lag transmission module, the alarm device rings, and a liquid mist anti-theft device is triggered to spray around a transformer to enable a thief to be adhered with a fluorescent agent, thereby bringing convenience for the police to find and timely arrest the thief.