The accuracy of sliding beam indication is an important indicator of the Fresnel Lens Optical Landing System (FLOLS).In response to the requirements of dynamic flight inspection of FLOLS, the overall requirements to the UAV calibration platform are analyzed from the perspectives of the influence distance and angle measurement accuracy of the calibration system and the imaging performance of the photoelectric platform.The basic composition, calibration process, calibration data processing and error analysis of the UAV calibration system are introduced.Finally, the key technologies and solutions of calibration are analyzed.The study shows that the calibration method based on the UAV differential GNSS technology meets the requirements of regular calibration of FLOLS, and has the advantages of high flexibility and high organizational implementation efficiency.