The satellite detection and identification is critical to the mobile communication antenna tracking system. A satellite signal detection and recognition system based on FFT was designed and implemented. In the system, the recognition rate is ensured by detecting the satellite beacon signal for satellite recognition, and the frequency deviation is corrected by real-time FFT at the satellite tracking stage, so that the frequency deviation is kept within a certain range. Therefore, the accuracy and stability of the antenna in target-satellite tracking are improved.