In recent years, the ground-based observation experiments of lunar irradiance have been increasing. In order to meet the high-precision and high-frequency observation of the lunar radiation on the ground, it is necessary to develop a high-precision lunar automatic tracking system for tracking experiments. The designed tracking system uses the lunar position algorithm to obtain the zenith angle and azimuth of the moon for apparent motion tracking, and then uses the photoelectric tracking with the four-quadrant detector as the core device to accurately track the moon. The external field tracking experiments have shown that the combination of apparent motion tracking and photoelectric tracking has high-precision tracking effect. The tracking accuracy is within ±0.2°, indicating that the tracking system has high accuracy and reliability.