Circumferential welding cooling system for bidirectionally cooling surface of workpiece

The circumferential welding cooling system comprises a cylindrical workpiece and a welding gun, the cylindrical workpiece can rotate along with a mechanical rotating shaft, a single-hole water pipe fixedly connected with the welding gun and a multi-hole water pipe located on the rear portion of the welding gun are arranged above the cylindrical workpiece in the circumferential direction of the cylindrical workpiece at intervals, and the single-hole water pipe and the multi-hole water pipe are communicated with each other. A nozzle of the single-hole water pipe faces the current welding position of the cylindrical workpiece, a water outlet hole of the multi-hole water pipe faces the previous welding position of the cylindrical workpiece, and the water outlet hole is located in the face, facing the cylindrical workpiece, of the multi-hole water pipe. The multi-hole water pipe is arranged on the rear portion of the welding gun, so that a welding area is cooled through the single-hole water pipe during welding, t