The invention relates to a piston water supply type atomization gas generator and belongs to the technical field of atomization equipment. The piston water supply type atomization gas generator comprises a device body, a motor, a fan, a cylindrical net, a cylindrical throwing barrel, a rotating shaft, a speed-reducing transmission device, a speed-reducing transmission bracket, a piston water supply device, a water spray pipe, a bracket, a motor bracket and a water tank, wherein the fan and the cylindrical throwing barrel are fixed on the rotating shaft; the cylindrical net is sleeved outside the rotating shaft; a water supply pool is arranged at the bottom of the device body; the cylindrical net is supported by the bracket; the lower end of the water spray pipe is connected with an outlet of the piston water supply device; the upper end of the water spray pipe extends into the cylindrical net; one end of the rotating shaft is connected with an output shaft of the motor and the other end of the rotating shaft is connected with the speed-reducing transmission device; a water outlet pipe is arranged at the bottom of the water tank; an atomized gas outlet is arranged at the upper part of the side wall of a shell; and the water tank is covered on an upper port of the shell. Water is supplied through piston motion, is thrown out by the throwing barrel to collide with and pass through the cylindrical net and then acts with strong wind generated by the fan to form the atomized gas. The piston water supply type atomization gas generator has the advantages of simplicity in manipulation, complete water supply, large atomization quantity, high quality of the atomized gas, simple structure, convenience for use, and the like.