Annular welding device with positioning and pressing functions

The utility model belongs to the technical field of welding, and particularly relates to an annular welding device with positioning and pressing functions, a hoisting ring and a top plate are welded, one end of a rotating arm is welded above the top plate, a hole is formed in the bottom end of the rotating arm, a welding gun is arranged in the hole, a driving wheel and a driven wheel are arranged between the top plate and a cylinder, and the driven wheel is welded below the top plate. The driven wheel is meshed with the driving wheel, and a fixing plate is arranged in the barrel to fix the motor. A spiral ejector rod is movably connected with the transverse rod, a pushing cone is welded to the bottom end of the vertical pipe, a main compression spring is arranged below the pushing cone, a plurality of fixing buckles are evenly arranged on the edge of the bottom plate, and a contact ejector rod penetrates into the fixing buckles. The automatic positioning and pressing device has the advantages that the automat