The invention discloses a belt making method of a ring-shaped belt. The belt making method comprises the steps that 1, a fabric belt is transported to move a first welding cutting position of the fabric belt to a welding cutting station, and a waste belt is collected to move a second welding cutting position of the fabric belt to the welding cutting station, and wherein the fabric belt between thefirst welding cutting position and the second welding cutting position achieves the folding effect under the welding cutting station under the gravity of the fabric belt; and 2, after the fabric belton the welding cutting station is folded, the first welding cutting position and the second welding cutting position which are overlapped are welded together and cut to form the ring-shaped belt. Thebelt making method of the ring-shaped belt controls the fabric belt between the first welding cutting position and the second welding cutting position to achieve the folding effect under the weldingcutting station in the belt transporting process by using the gravity of the fabric belt, the welding transporting action and the folding action are equivalent to synchronous operation, and thus efficiency is improved. The invention further discloses a belt making device of the ring-shaped belt and processing equipment of the ring-shaped belt.