Aluminum alloy butt circular seam without liner single-sided welding double-sided forming automatic TIG welding method, use acetone to clean the oil around the butt circular seam of the cylinder body before welding, and use stainless steel wire wheel to remove the inner oxide film around the butt ring seam of the cylinder body. Preheating, debugging the control panel to control the welding current, voltage, welding speed, wire feeding speed matching in real time, using automatic tungsten argon arc welding machine welding, welding the first layer without adding wire back forming, adding welding wire filling in the second layer, Three layers of welding wire are added, and the welding torch is oscillated to form the cover surface. The invention adopts simple equipment, convenient operation, realizes welding automation, stable welding, fast welding speed, low production cost, less filler wire, less welding layers, and less deformation after welding. No correction is required, the appearance is beautiful and the welding seam quality is high.