The invention provides an atomization gas quenching device, comprising a quenching box body which is provided with a cover at the top and is internally provided with an internal cylinder with holes, current collectors and carrier netting pieces are fixed in the internal cylinder at interval by supporting rods; the atomization gas quenching device is characterized in that: the atomization gas quenching device comprises an atomization box which is connected with the quenching box, the atomization box comprises an outer box body which is provided with a gas inlet and a liquid outlet, and an inner cylinder which is arranged in the outer box body and is provided with holes on the wall and is internally provided with a cavity, the liquid inlet on the box body is extended in the inner cylinder, and a nozzle is arranged on the inner end opening; the liquid medium for quenching is atomized in the atomization box through the nozzle and then is mixed with the gas, and then the atomized gas and the liquid mixed medium are provided to the quenching box, so as to improve the quenching efficiency, ensure the quenching quality and eliminate the defects on the surface of the parts; the structure is simple, the usage is convenient, the atomization effect is good, the ingredients are uniform, and the water and gas feeding can be controlled respectively, and the content ratio of the atomization composition ca be easily adjusted, so as to meet the atomization requirements of different workpieces.