The invention discloses improved dust removal equipment for second-hand household appliances. The improved dust removal equipment comprises a dust removal chamber. An outer tooth ring is hinged onto the top surface of the dust removal chamber, a vertical air supply pipe is fixedly connected to the inner side of the outer tooth ring, air blowing pipes are connected onto the air supply pipe, air blowing openings of the air blowing pipes face the central axis of the dust removal chamber, the upper end of the air supply pipe penetrates an annular straight slot formed in the upper end of the dust removal chamber, a sealing mechanism is arranged in the annular straight slot and comprises sealing plates, the sealing plates are inserted in the annular straight slot, an end of each sealing plate ishinged onto the inner wall of the annular straight slot, and a pressure spring is butted to a side of a hinge joint of each sealing plate and the inner wall of the annular straight slot; a dust suction mechanism is fixed to the top of the dust removal chamber and comprises a dust suction tank, a dust suction pipe, a dust collection box and water, the dust suction pipe is inserted in a side wall of the dust suction tank, the dust collection box is fixed onto the top surface of the inner side of the dust removal chamber, the inner bottom of the dust suction tank is filled with the water, an annular air channel is inserted in the outer side wall of the upper end of the dust suction tank, and the upper end of the air supply pipe is inserted in the air channel. The improved dust removal equipment has the advantages that dust on the second-hand household electric appliances can be conveniently removed by the improved dust removal equipment, and secondary pollution can be prevented.