The invention provides a double-seam automatic welder and relates to the technical field of
welding devices. The double-seam automatic welder comprises a lathe
bed, a left clamp, a right clamp and
welding gun mechanisms, the left clamp and the right clamp are arranged on the lathe
bed and used for clamping a workpiece, the
welding gun mechanisms are arranged on the left clamp and the right clamp respectively, and each welding gun mechanism comprises a transverse rough adjustment device, a vertical adjustment device, a transverse fine adjustment device, a vertical linkage device and an angle adjustment device which are connected with one another in sequence. By means of the double-seam automatic welder, the whole structure design is reasonable, double-
seam welding works can be synchronously finished, only one welding gun mechanism can be started according to work demands, positions of the right clamp and welding guns can be adjusted according to size of the workpiece, and welding requirements of various workpieces can be met. Besides, the welding gun mechanisms can accurately adjust positions of the welding guns according to workpiece size and welding seam positions so that the welding requirements can be met, and welding qualities can be guaranteed.