Heat dissipation device of power distribution network switch cabinet

The utility model discloses a heat radiation device of a power distribution network switch cabinet, comprising a rectangular housing, one side of the rectangular housing is an opening structure, the outer wall of the rectangular housing is provided with a rectangular fixing frame close to one side of an opening, and one side of the rectangular housing is provided with a cooling assembly at the topof the outer wall far away from one side of the opening. The rectangular shell extends to form an extension portion of a trapezoid structure close to the bottom of the cooling assembly, cooling finsdistributed at equal intervals are arranged at the position, close to the cooling assembly, of the inner wall of the rectangular shell, the cooling fins extend into the extension portion along the inner wall of the rectangular shell, a partition plate is welded to the inner wall of the rectangular shell, and the partition plate is welded to the inner wall of the rectangular shell. The section of the partition plate is of a