Abstract: The roof prism plays a crucial role in optical sighting systems, serving functions such as adjusting light paths, rotating images, directing reflections, and shortening optical paths. With the increasing precision requirements of optical systems, there is a stringent demand for accuracy in the angular errors, surface shape errors, and surface roughness of roof prisms, presenting a significant challenge in the optical manufacturing industry. Consequently, research on high-precision calibration prism processing technology is proposed. Firstly, a process analysis of high-precision roof prisms is provided, and the key difficulties and critical points in prism fabrication are pointed out. Subsequently, the design of high-precision calibration prism processing schemes, the methods of processing technology, and their implementation are elaborated. The detection and control methods for achieving a spatial 90° angle are adressed, resulting in an increase in the first-pass yield of parts from 5% to approximately 60%. Additionally, a dedicated repair fixture is designed, leading to an increase in the yield rate to over 80% after a single repair. It presents an optimization of the processing technology for ridge prisms, resulting in improved machining precision and higher yield rates. This advancement is of significant importance to the optical manufacturing industry, particularly in the production of high-precision optical components.