The invention discloses an electric power distribution cabinet which comprises a cabinet body. The bottom of the cabinet body is provided with a heat radiation device, the middle of the cabinet body includes an electrical cavity, the front end of the cabinet body is provided with an operation cavity, a buckling groove with an arched bottom side is formed encircling the operation cavity in the inner wall of the operation cavity, a door plate is installed in the operation cavity, two connecting lugs are welded and fixed to the inner wall, facing the door plate, of the electrical cavity, and oneend of a connecting support is rotationally connected with an installation plate. When not being used, the installation plate is in parallel with the horizontal plane, an electrical module on the installation plate can be protected effectively, and avoided from damage caused by opening of a cabinet door or impact, the installation plate becomes vertical when the cabinet door is opened, operation is convenient, an upwind elastic rubble film realizes floating when the cabinet is not used, the electrical module on the installation plate realizes micro movement, and match the heat radiation devicein the top better, and the air flows more effectively.