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The radar signal tracking control system is an important part of the airborne measurement and control system.In order to ensure that the antenna can be aligned with the aircraft in real time, and ensure the stability and real-time of the communication, a radar signal tracking control system based on STM32 is designed.The STM32F407IG control chip is used as the processor of the signal tracking control system.The desired control action is determined by processing the azimuth difference voltage ΔA signal and the pitch difference voltage ΔE signal from the four phase modulation receiver.In order to ensure the reliability of the azimuth difference voltage ΔA signal and the pitch difference voltage ΔE signal, the hardware and software filter are designed.PWM pulse function is used to control the stepper motor rotation, and the motor can be used to control the motor precision and speed.To improve the reliability and real-time performance of the differential voltage signal by using the high precision and high speed ADC.Real time feedback is used to form the closed loop control to ensure the reliability of motion.Through repeatedly debugging and testing of software and hardware, the receiver output voltage range difference ΔA and pitch difference voltage ΔE level remained at relatively low range, and communication is normal and stable for a long time.This proves that the radar signal tracking control system realizes the tracking control of the aircraft.