The invention relates to a special door lock for electric power. The special door lock comprises a fixed lock nose fixedly installed on a box body or a cabinet body, and a lock nose inserting opening formed in a box door or a cabinet door. An upper lock nose hole is formed in the upper half portion of the fixed lock nose, and a lower lock nose hole is formed in the lower half portion of the fixed lock nose. A square opening is formed in the position, close to the lock nose inserting opening, on a door plank. A groove corresponding to the square opening is formed in the inner wall of the door plank. A sliding pin capable of being matched with the lower lock nose hole in a plug-in mounting manner is installed in the groove in a sliding manner. A sealing strip penetrating mounting mechanism is arranged between the sliding pin and the inner wall of the groove. A sliding plate capable of closing the opening is installed on the square opening in a sliding manner. One end of the sliding plate is fixedly connected with a movable lock nose corresponding to the upper half portion of the fixed lock nose, and a movable lock nose hole corresponding to the upper lock nose hole is formed in the movable lock nose. The special door lock for electric power is simple in structure and convenient to use, the phenomenon that an electrodynamometer or an electric control cabinet is opened by accident and opened with violence can be better effectively prevented, and safety is high.