The invention relates to a deformation compensation processing method for a spiral bevel gear. A technology for measuring a root cone position of the spiral bevel gear through a three-coordinate measuring system and a technology for grinding and processing a conical root cone of the spiral bevel gear are applied, and compensation processing is carried out on a reference end surface through a spiral bevel gear carburization deformation compensation processing method, so that the influence of the carburization deformation on a root cone grinding allowance is eliminated, and a carburized part root grinding allowance is ensured to meet the specified requirement.