Abstract: An novel high-precision intellectualized electronic digital display autocollimator for two-dimensional photometry was designed, which could be used to measure small angles.The wavelength of the system was 670 nm.The foldback system was adopted in order to reach 1 m focal length and reduce the volume of the system.The position sensitive detector (PSD) was used as the optical receiver so that the accuracy of the instrument was increased and could meet the requirements that the measurement range was 6 and the accuracy was 0.1. The optical path system of the autocollimator was designed and optimized by Zemax.The emergent rays were parallel and the rays received by the determinand were homogeneous as shown in footprint diagram.These results can meet the needs of practical manufacture well.