The invention discloses a fast cleaning electrical cabinet. A cabinet body includes a top plate, a bottom plate, and side plates and a back plate which arranged in an enclosure manner between the topplate and the bottom plate. A front plate is provided with an opening, and a cabinet door is hinged to the opening. Two guiding through slots are formed in each side plate along the vertical direction, and the two guiding through slots are near the corners of the cabinet body. A sliding block is embedded into each guiding through slot in a sliding manner. A cleaning rod is connected between the two sliding blocks in the same plate surface. A cleaning part is formed towards the inside of the corresponding side plate on each cleaning rod, and each cleaning part abuts against the inner wall of the corresponding side plate. A curved sliding slot is formed in the back plate from top to bottom and from the edge of one side to the edge of the other side, a sliding block is embedded into the curved sliding slot in a sliding manner, one end of the sliding block located inside the cabinet body is rotationally connected with a cleaning wiper disk which abuts against the inner wall of the back plate. The fast cleaning electrical cabinet has the advantages of simple structure, convenient operation, easy cleaning of internal dust, cleaning time and physical strength saving, prolonged service life of electrical components and higher use safety.