The invention provides a processing method of a tube body metal loss ring. The processing method comprises the steps of fixing a tube body to be processed on a rotating shaft, wherein the rotating shaft comprises a first wheel delivery disc; fixing the rotating shaft on a support frame; enabling the first wheel delivery disc to be connected with a second wheel delivery disc of a motor by a chain; fixing an angle grinder at a first position of a rotating rod, wherein the angle grinder comprises a grinding wheel piece; fixing a depth adjustment piece at a second position of the rotating rod, and controlling the distance between the second position and the first position to be within a preset range; adjusting the relative depth between the depth adjustment piece and the outer edge of the grinding wheel piece to be the first depth; enabling the motor to run, and controlling the rotation of the tube body to be processed by the motor; enabling the angle grinder to run, rotating the rotating rod to enable the grinding wheel piece to be jointed with the outer wall of the tube body to be processed, and grinding until the depth adjustment piece is in contact with the outer wall of the tube body to be processed.