Cylinder circular seam groove protection device

The utility model relates to a cylinder circular seam groove protection device which comprises at least three supporting assemblies evenly distributed in the circumferential direction of a first protruding part, each supporting assembly comprises a supporting seat, a clamping groove is formed in the top of each supporting seat, and a first clamping groove is formed in the top of each supporting seat. A supporting face used for supporting the first protruding part and a receding groove used for containing the second protruding part in a suspended mode are formed in the clamping groove. Due to the fact that the at least three supporting assemblies are evenly distributed in the circumferential direction of the first protruding part, the barrel can be vertically supported, the barrel does not need to be horizontally stored, the inner diameter of the barrel cannot be deformed, and the follow-up assembling and welding quality cannot be affected; when the groove of the barrel is placed downwards, due to the arrangem