The invention provides a forging process of a bell housing provided with a special-shaped channel. The forging process comprises the steps of blanking, specifically, a blank material with a proper diameter and a proper length is selected; blank making, specifically, surface oxide of the blank material is removed, and the weight of the blank material is controlled within a reasonable range, so thata qualified blank is obtained; warm-forging forward extrusion, specifically, warm-forging forward extrusion is conducted on one end of the blank, so that a rod part is formed; warm-forging upsetting,specifically, warm-forging upsetting is conducted on the other end of the blank, so that the outer contour of a housing part is formed; warm-forging formation, specifically, warm forging is conductedon the blank through a warm-forging forming die, so that the housing part and a transition part are primarily formed to obtain a semi-finished bell housing, wherein a plurality of discharging ribs are additionally formed on the inner wall of the housing part of the semi-finished bell housing, and wavy concave-convex structures are additionally formed on the outer wall of the housing part of the semi-finished bell housing; and cod-forging formation, specifically, cold forging is conducted on the housing part of the semi-finished bell housing through a cold-forging forming die so that materialsof the housing part of the semi-finished bell housing can further flow to obtain a finished bell housing.