Disclosed is an electric power circuit maintaining apparatus. The electric power circuit maintaining apparatus comprises a vehicle body, a rotary lifting assembly, an operating bracket, a camera and a maintenance assembly; rotation in a horizontal plane, lifting in a vertical direction and extension in a horizontal direction of the operating bracket, the camera and the maintenance assembly can be realized by virtue of the rotary lifting assembly; and the maintenance assembly comprises a crushing part, a mounting part and a dehumidifying part. Dehumidifying maintenance to a high-altitude insulator is realized by virtue of matching between the camera and the dehumidifying part in the maintenance assembly, so that power grid electric leakage caused by damage of the insulator or a cable can be prevented; by virtue of the crushing part, the damaged and useless insulator can be subjected to crushing treatment automatically, so that harm to a human body caused by spluttering in manpower fragment crushing can be prevented; and by virtue of the mounting part, fetching of the insulator is realized, and mounting can be realized by matching with manpower conveniently.