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The current satellite communication tracking control system can only maintain the accuracy of the micro-arc measurement level, and the tracking control accuracy is difficult to meet user requirements. In order to solve the above problems, a new satellite communication tracking control system is designed based on the expanded state observer. The system hardware mainly designs the control module, sensor module, power module and motor drive module. The core chip of the control module selects the SXD320F2784 model to increase the processing frequency. The power chip is the TDG3320 chip, which can ensure that the fixed voltage is converted into an adjustable voltage, and the sensor module passes The AHRS axial sensor, GPS, and beacon machine are composed to ensure the sensing ability. The motor drive module is designed with the L845N chip to increase the rated voltage. The extended state observer is introduced, and the software process is realized through system initialization, antenna latitude and longitude calculation, error comparison, satellite communication signal tracking control, and driving DC motor. The experimental results show that the designed satellite communication tracking control system can improve the tracking accuracy from the original micro-arc metric level to the nano-arc metric level, effectively improve the tracking accuracy, enhance the interference suppression capability of the system, and ensure that the peak value of the control input meets its requirements.