Pipeline welding robot

The utility model discloses a pipeline welding robot which comprises a bottom frame, a buffer plate is arranged on the bottom frame, a transverse box is fixedly installed on the top of the buffer plate, vertical boxes are fixedly installed on the two sides of the top of the transverse box, and fixed box bodies are fixedly installed above the opposite sides of the two vertical boxes. And limiting grooves are formed in the tops of the two fixed box bodies. According to the pipeline welding robot, a motor, a transverse box, a fixing frame, a welding mechanism, a hand wheel, an adjusting lead screw, an upper fixing piece, a lower fixing piece, a movable block, a limiting groove, a fixing box body, a threaded rod, a vertical box, a transmission mechanism, a through hole, a transverse shaft and a limiting rod are used in cooperation, and the pipeline welding robot clamps and fixes a pipeline through the upper fixing piece and the lower fixing piece; and due to the mobility of the upper fixing piece, pipelines of di