Automatic alignment device for welding of water conveying pipeline

The utility model provides an automatic alignment device for welding of a water conveying pipeline, which comprises a bottom frame capable of axially moving and arranged in a metal pipe, a workbench fixedly arranged on the bottom frame and an alignment component horizontally and rotatably arranged on one side of the bottom frame, the connecting cylinder is horizontally and rotatably connected to the top of the workbench, the mounting cylinders are arranged around the axis of the connecting cylinder at equal angles, the ends of the mounting cylinders are fixed to the connecting cylinder, the abutting plates are axially and slidably connected to the movable ends of the mounting cylinders, and the abutting plates are in threaded connection to lead screw guide rails at the movable ends of the mounting cylinders; a fixing structure is vertically and telescopically arranged on the top of the workbench. According to the utility model, the effects of improving the alignment quality of the metal pipe in the large-diam