Protective device for high-voltage power supply

The utility model relates to the technical field of high-voltage power supply, in particular to a high-voltage power supply protection device which comprises a bottom plate, a cabinet body is installed on the upper surface of the bottom plate, a cabinet cover is installed on the upper surface of the cabinet body, heat dissipation holes are formed in one side of the cabinet body, a protection structure is arranged on the surface of the cabinet body, and the protection structure comprises a limiting frame. The limiting frame is fixedly connected with the surface of the cabinet body, a sliding groove is formed in the surface of the limiting frame, a protective cover is slidably connected into the sliding groove, a U-shaped frame is fixedly connected to the side, away from the heat dissipation holes, of the protective cover, a plug pin slidably penetrates through the surface of the U-shaped frame, and a limiting plate is fixedly connected to one side of the limiting frame. A round hole is formed in the surface of