The invention relates to the field of power equipment, in particular to a high-efficiency heat-dissipation power distribution cabinet. The high-efficiency heat-dissipation power distribution cabinet comprises a vertically arranged supporting and mounting barrel, wherein a supporting and mounting plate is horizontally arranged under the supporting and mounting barrel; a rotating door is rotationally arranged at the right end of the supporting and mounting barrel through a hinge; a plurality of heat dissipation holes are uniformly formed at the wall of the supporting and mounting barrel; a limiting rotating column is vertically arranged in the middle portion of the inside of the supporting and mounting barrel; a limiting mounting sleeve is arranged at the top of the supporting and mounting barrel in a manner of matching with the limiting rotating column, through the three-dimensional multilayer mounting structure, the mounting quantity of the power elements of the device is obviously increased, and the heat is dissipated by porous uniform diversion, diversion small cage package is controlled by cooperating with a guide lifting structure so that the inside heat dissipation efficiencyis controllable, the axial rotation shifts so that the inside power component homoenergetic of device is maintained quickly, and the radiating efficiency and the operating stability of the power distribution cabinet are obviously improved.