The invention discloses a 
welding machine with a 
welding fume multiple collecting and filtering mechanism and a filtering method, and relates to the technical field of 
welding. The purposes of completely collecting 
welding fume and preventing leakage are achieved. The welding 
machine comprises a bottom plate, a sliding seat 
assembly is fixedly connected to the outer wall of the top of the bottom plate, a filtering 
assembly is fixedly connected to the outer wall of the top of the sliding seat 
assembly, a vertical frame is fixedly connected to the outer wall of the top of the sliding seat assembly, a 
transverse beam is fixedly connected to the outer wall of the top of the vertical frame, an air suction assembly is fixedly connected to the outer wall of the top of the 
transverse beam, and an outer cover assembly is fixedly connected to the inner wall of one side of the 
transverse beam. The filtering method of the welding 
machine comprises the following steps of gas conveying, preliminary 
ionization, deep filtering, waste 
settling and gas discharging. By arranging a top cover, a folding cover, a bottom cover, the vertical frame and a supporting plate, a 
closed space can be constructed for a welding area, the 
closed space only has one outlet, namely, a gas outlet 
pipe, when high-temperature 
welding fume is generated, the high-temperature 
welding fume rises to the gas outlet 
pipe to be discharged out of the 
closed space, and the 
recovery efficiency of the welding fume is improved.