Tower drum longitudinal seam welding device

The utility model provides a tower drum longitudinal seam welding device which comprises a fixing frame, a lifting platform capable of moving up and down is horizontally arranged on the fixing frame, a through groove is vertically formed in the middle of the lifting platform, a tower drum is arranged below the lifting platform and placed on a rolling wheel frame, and a seam on the tower drum is upwards formed in the through groove. Two trolley tracks parallel to the joint are arranged in the through groove, sliding rails are transversely arranged in the through groove in the two ends of the trolley tracks, the two ends of the trolley tracks are fixed to positioning plates, and the positioning plates are in sliding connection with the sliding rails. According to the welding device for the longitudinal seam of the tower drum, the seam on the tower drum is rotated to the corresponding position of the through groove through the roller frame, and the lifting platform is moved downwards, so that the seam is located