The utility model discloses an outdoor distribution box anti-theft device which comprises a box door, a door lock seat, an electromagnetic locking lock, an electric conduction pillar and a key hole shaft are arranged on the inner wall of the box door, a door lock shaft for opening and closing the box door is connected into the door lock seat in a rotating mode, and a door handle is connected to the front end of the door lock shaft in a rotating mode. The outer side of the box door is perpendicularly provided with a groove for containing the door handle in a concealed mode, a connecting rod is perpendicularly arranged on the inner side of the lower end of the door handle, and a clamping groove is formed in the upper portion of the inner end of the connecting rod. The outer end of the electric conduction pillar is connected with an alarm, an alarm circuit is connected to the inner end of the electric conduction pillar, and an elastic conduction sheet is connected to the upper end of the alarm circuit. When the door handle is contained in the groove in the concealed mode, the clamping groove in the connecting rod is connected with a spring bolt in a buckling mode, and the elastic electric conduction sheet is clamped between the clamping groove and the spring bolt. According to the outdoor distribution box anti-theft device, a door lock of a distribution box and the electromagnetic locking lock in a monitoring equipment operation state are linked, the door handle of the door lock is locked so that the door handle cannot swing backwards and recede out of the groove in the box door of the distribution box and the door lock shaft cannot be rotated, the operation of wrongly opening the door is avoided, and safety and reliability are achieved.