The invention discloses a gearbox parking gear manufacturing method. The manufacturing method comprises the steps of feeding, shot blasting, heating, warm forging, hardening and tempering, shot blasting, cold shaping, end face finish turning, internal spline broaching, induction surface quenching and flaw detection, wherein the warm forging machining process further comprises the steps of upsetting, pre-forming, final forming, punching and trimming. According to the gearbox parking gear manufacturing method, a gearbox parking gear is manufactured through the warm forging, the quenching and tempering, the cold shaping and the induction quenching of medium carbon steel, the tooth surfaces of parking teeth do not need to be machined subsequently after the warm forging, and the forging streamline of the tooth surfaces of the parking teeth is not cut off, so that a subsequent product keeps high mechanical strength; a core part of a product is quenched and tempered, the quenched and temperedsorbite structure can keep high strength and high toughness, the cold shaping is carried out after the hardening and tempering to correct thermal deformation of the hardening and tempering, and the surfaces of the parking teeth are subjected to high-frequency quenching, so that low thermal deformation and high surface hardness are kept; and the gearbox parking gear manufacturing method is reasonable in design, the process advantages of net forming forging, hardening and tempering and surface quenching are combined, the material utilization rate is increased, the machining and manufacturing cost is reduced, surface oxidation and thermal deformation of the product are effectively controlled, and the precision and quality of the product meet the use requirements.