Multi-star simulator is a device that can simulate the position, magnitude and spectral information of multiple stars in the sky in a test chamber, used to complete indoor testing and calibration of star sensors. The design of the single star simulator and bracket that form a fixed distributed multi-star simulator for the test requirements of the star sensor equipment is described in detail in the article, as well as the detection instruments and methods used to test the stability of the simulated star angle position of the multi-star simulator and the error of the simulated star angle position caused by translation. The test results show that the performance indicators of the multi-star simulator meet the design requirements and can be used for indoor dynamic and static performance test of the star sensor.