Auxiliary power supply for power distribution cabinet monitoring device

The utility model discloses an auxiliary power supply for a power distribution cabinet monitoring device, which relates to the technical field of low-voltage power distribution cabinets and comprises a low-voltage power distribution cabinet, a power supply assembly is arranged in the low-voltage power distribution cabinet, and a limiting mechanism is arranged below the power supply assembly and comprises a thin-wall limiting frame. A circular pulling plate is arranged outside the thin-wall limiting frame, and a limiting long rod is fixedly connected to the right side face of the circular pulling plate. The power supply assembly can be downwards placed above the monitoring assembly, a first limiting block can be limited through an arranged fourth limiting block, so that installation of the power supply assembly is completed, and when the power supply assembly needs to be replaced, a round pulling plate is pulled in the direction away from a thin-wall limiting frame, so that the power supply assembly is replace