Electrical switch cabinet with expanded mounting frame

The utility model relates to an electrical switch cabinet with an expanded mounting frame, which comprises a cabinet body, a mounting frame is arranged in the cabinet body, a connecting clamping strip is arranged in the mounting frame, an electrical assembly is connected onto the connecting clamping strip in a sliding manner, and a lead frame is arranged at the upper end of the connecting clamping strip in the mounting frame. The left side edge and the right side edge of the installation frame are rotationally connected with expansion arms through rotating arm assemblies, the inner sides of the left expansion arm and the right expansion arm are rotationally connected with expansion plates through rotating shafts respectively, and the left expansion plate and the right expansion plate are turned downwards and then matched to form an additional electrical installation base. The expansion structure is added to the mounting bracket in the existing switch cabinet, so that the expansion mounting seat is provided wh