Pipeline welding supporting tool

The utility model relates to the technical field of pipeline welding equipment, in particular to a pipeline welding supporting tool which comprises a pair of movable frames, and adjusting devices are connected to the movable frames. The adjusting device comprises a U-shaped frame fixedly connected with the movable frame, an adjusting cylinder is rotationally connected to the U-shaped frame, and a rotating structure matched with the adjusting cylinder is arranged on the U-shaped frame; a fixed cylinder is rotationally connected to the adjusting cylinder, and a fixed structure is arranged on the fixed cylinder; any one adjusting cylinder is detachably connected with a synchronous structure, and the synchronous structure is detachably connected with the other adjusting cylinder; according to the pipeline welding supporting tool, a welder is prevented from standing for welding operation for a long time, the fatigue strength of the welder during welding of medium-diameter and large-diameter pipelines is relieved,