Gantry type welding tool for circular seams of cylinder of wind power generation tower

The utility model relates to a gantry type welding tool for circular seams of a cylinder of a wind power generation tower. The tool comprises a support provided with traveling wheels and a lifting platform. The lifting platform is arranged in the support, and a telescopic platform is arranged on the lifting platform. A recovery box is arranged at the lower portion of the support, guide rails connected with the support are arranged between the four corners of the lifting platform and the top of the support, and sliding sleeves are arranged on the guide rails. A locking mechanism is arranged between every two adjacent sliding sleeves. A ladder stand is arranged between the support and the lifting platform and protective guards are arranged on the lifting platform. The gantry type welding tool for the circular seams of the cylinder of the wind power generation tower is simple in structure, convenient to operate, high in welding quality, capable of being used for welding the circular seams of the cylinder and also capable of processing defects of the circular seams of the cylinder.