In order to complete the calibration work of the star sensor, a high- precision collimating optical system with large field of view is designed. According to the static star simulator′ s working principle about cohesion between exit pupil of star simulator and entrance pupil of star sensor, the design principle and parameters of optical system is determined. The design results show that the field of view is Φ39°, distortion is less than 0.1% . A method of making star point board in accordance with aberrations of the optical system is put forward, to avoid process of repeatedly engraving star point board. Finally, the design of the system is tested. According to the testing results: simulated accuracy of the whole system reaches 15″ , the data can meet the using requirement of high accuracy with large field static star simulator.