In order to test the performance of acquisition and tracking in space laser communications, a satellite vibration analog source system is proposed and designed. The system gets standard vibration power spectral density function by upper computer with LabVIEW software, and then transmits the simulated signals of vibration platform to control system with the core of STM32F4 in order to make the galvanometer swing for pitch and azimuth. Based on SILEX platform model designed by European Space Agency (ESA), the feasibility of the program is derived and verified. Also an experimental site is built to monitor the miss distance in real time by detectors and analysis the miss distance power spectrum. Simultaneously, the pseudo-random sequence in practical applications is processed and optimized. The experimental results show the amplitude accuracy of vibration source is better than 2 μrad and the system simulated results are real and effective. In addition, the amplitude of analog system can reach ±10 mrad since its frequency can be adjusted. Therefore the system can easily simulate different standard models and provide the conditions for acquisition, pointing and tracking (APT) verification in the laboratory.