The invention belongs to the technical field of welding machines, specifically a stainless steel pipe welding machine, comprising a spot welding machine, a frame, a support plate, a first bracket, a second bracket, a bearing, a threaded pipe, an opening, a threaded pipe sleeve, a passive Pulleys, transmission belts, driving pulleys, motors, chassis, pipes, boxes, air inlet pipes, air outlets, activated carbon filters and fans. The motor provided in the present invention can drive the threaded pipe to rotate through the driving pulley, the transmission belt and the passive pulley, and the two threaded pipes provided can bite the two pipe bodies to be welded under the action of the threaded sleeve, so that the two The pipe body to be welded is welded in a rotating state; the set fan can effectively suck the smoke generated during welding into the box, and remove harmful components in the smoke through the activated carbon filter inside the box.