The invention discloses a process method for machining and aligning a single clack of a four-clack socket ring. By means of the technical steps of single-clack inspection, alignment, rough machining,calculation and numerical control compensation, finish machining and accurate measurement, machining and alignment of the single clack of the four-clack socket ring are completed. Meanwhile, the technical effect of ultrahigh-precision machining is achieved by applying precise measurement in cooperation with numerical control compensation, and cannot be achieved by previous large machining. The process method has the beneficial effects of being easy to operate, high in alignment precision and small in accumulative error, guaranteeing the small closed face clearance formed during circling aftermachining and the like, the production period can be shortened, and the machining quality can be improved.