The invention discloses an automatic welding supporting device of 60-degee major-diameter thick-wall tapered circumferential seams, which has lower manufacture cost and comprises a fixed bottom plate, wherein the fixed bottom plate is respectively fixedly provided with a pair of front supporting upright posts and a pair of rear supporting upright posts, the pair of front supporting upright posts are respectively fixedly provided with a driven wheel supporting seat, driven wheels are rotatably arranged in the driven wheel supporting seats through driven shafts, the pair of rear supporting upright posts are respectively fixedly provided with a drive wheel supporting seat, drive wheels are rotatably arranged in the drive wheel supporting seats through drive shafts, the drive shafts are connected with drive motors fixedly arranged on the drive wheel supporting seats, the middle part of the rear end of the fixed bottom plate is fixedly provided with a catch wheel supporting seat, and a catch wheel is rotatably arranged in the catch wheel supporting seat through a catch wheel shaft. The automatic welding supporting device of the 60-degee major-diameter thick-wall tapered circumferential seams has the advantages of lower manufacture cost, simple and practical structure and higher production efficiency, and is suitable for massive and continuous production.