The invention discloses an efficient heat dissipation type power distribution cabinet. The cabinet comprises a cabinet body, a cabinet door, supporting legs, an air inlet hole, a sewer pipe, a bent pipe, a funnel, an air outlet hole, a right-angle sliding groove, a lining plate supporting seat, a lining plate device, a linkage device and a heat dissipation device, wherein the cabinet door is hinged to the front side of the cabinet body through a hinge, and the four supporting legs are welded to the bottom of the cabinet body; air inlets are formed in the lower portions of the left side and the right side of the cabinet body respectively, the sewer pipes are fixed to the lower portions of the left side and the right side of the cabinet body, the upper portions of the sewer pipes are communicated with bent pipes, the bent pipes are located on the inner walls of the left side and the right side of the cabinet body, and funnels are welded to the tops of the bent pipes and located on the top of the cabinet body. According to the cabinet, a traditional bowing and squatting installation mode is changed, installation and maintenance efficiency of components is improved, heat transfer is carried out on the interior of the cabinet body through rainwater, the temperature in the cabinet body is reduced, and heat dissipation in the cabinet body is greatly accelerated.