The invention discloses a power supply monitoring device convenient to maintain, and belongs to the technical field of power supply monitoring, the power supply monitoring device comprises a box body, a first cavity is formed in the box body, a pushing mechanism is clamped on the upper surface of the inner wall of the first cavity, a cam is lapped on the upper surface of the pushing mechanism, and a driving mechanism is fixedly connected to the front surface of the cam. According to the power supply monitoring device convenient to maintain, the first electromagnetic valve, the sliding sleeve, the clamping rod and the clamping hole are arranged, the first electromagnetic valve is controlled to be opened, the second electromagnetic valve is controlled to be closed, the driving mechanism is controlled to work, and when the piston plate moves downwards in the first cavity, the clamping rod moves out of the clamping hole. Compared with the existing power supply monitoring device, the device can be disassembled without repeatedly operating the screw by using an auxiliary tool, so that the operation is relatively simple, a worker can quickly disassemble the power supply monitoring device, and the worker can conveniently maintain the device.