The invention discloses a composite seal ring and a manufacturing process of the composite seal ring, and belongs to the field of manufacturing of a rubber seal ring. The composite seal ring comprises the materials of 10-100 parts of natural rubber, 10-100 parts of butadiene styrene rubber, 10-100 parts of high styrene resin, 2-10 parts of zinc oxide, 1-3 parts of stearic acid, 0.5-2 parts of accelerant DM, 0.5-2 parts of accelerant CBS, 1-3 parts of antiager RD, 1-3 parts of antiager 4010NA, 2-10 parts of petroleum resin, 20-100 parts of high abrasion furnace black, 20-100 parts of general purpose furnace black, 0.5-4 parts of sulphur, and 3-20 parts of vinylon cut fiber masterbatch. The manufacturing process provided by the invention innovatively manufactures the vinylon cut fiber masterbatch first, and additionally uses a short fiber to directionally arranged in the rubber during extruding formation, so that a working surface has a higher tear strength, and the subsection sulfuration in the sulfuration process leads to uniform and consistent sulfuration degree. The seal ring manufactured by using the manufacturing process has the effects of low compression deformation, excellent elasticity, high hardness, excellent tearing strength, and good sealing effect.