The invention discloses a stainless steel welding method. The stainless steel welding method comprises the following steps that stainless steel needing to be welded is sent to a laser cleaning machinefor cleaning; a cutting machine is adopted to cut a welding opening of the stainless steel; a thousand-blade wheel is adopted to grind a welding groove after cutting; the ground stainless steel welding opening is sent to an acetone solution for soaking; and the soaked stainless steel is pre-heated. According to the stainless steel welding method, firstly, laser is adopted to clear an oxide layerand oil dirt on the surface of the stainless steel before welding, the speed of laser cleaning is high, and cleaning is uniform; multi-layer and multi-pass welding of low linear energy is adopted, positions of weld joints of welding samples are relatively uniform, properties of the welding samples are good; and the stainless steel is pre-processed finally, diffusion of hydrogen in weld joint metalis facilitated, hydrogen-induced cracking is avoided, welding stress is lowered, and better application prospect is brought.