With the rapid development of China's planetary exploration project, the communication requirements between spacecraft and ground are getting higher and higher, the antenna aperture is getting bigger and the antenna panel structure is more complex. Large antenna use process, by the temperature, wind, frost, rain, snow and other natural factors, as well as the role of their own gravity, with the passage of time, the antenna structure will inevitably deformation. On the other hand, with the change of antenna pitch angle, the antenna panel will be deformed by gravity. In order to meet the requirements of fast adjustment of antenna face shape and antenna performance analysis for engineering tasks, it is very important to obtain antenna shape variables with high efficiency and high accuracy.This paper adopts the scheme of high precision 3D laser scanner to measure the antenna panel deformation, and constructs a large antenna panel deformation dynamic detection system. And it was applied to the largest fully movable 70 m antenna in Asia at Tianjin Wuqing Station, which was constructed by China's Tianqin-1 Mars Exploration Project. By measuring, analyzing and processing the antenna panel point cloud data, the 70 m antenna panel deformation information was obtained.According to the characteristics of the point cloud data of antenna panel, we adopt the fitting paraboloid specific algorithm for point cloud data alignment to realize the alignment between the point cloud data of theoretical model and actual measured point cloud data, and achieve high efficiency and high accuracy alignment after many falls.The statistical algorithm removes the discrete point cloud data, and the surface fitting algorithm removes the point cloud number data of antenna structure. Finally, the filtering of antenna panel point cloud data and antenna panel deformation analysis are realized, which realizes the high-efficiency, high-precision and automated large antenna panel deformation detection. The data of the theoretical model of the antenna panel is constructed as a grid, and the distance from the measured data to the theoretical model is calculated to obtain the deformation information of the antenna panel.The 3D laser scanner deformation measurement method is applied to the data of the antenna panel at 20, 48 and 70 degrees to obtain the deformation results of different pitch angles and compare and analyze the effect of gravity on the antenna panel. According to the measurement results, it is shown that this paper achieves the antenna panel deformation measurement by 3D laser scanner and the accuracy reaches sub-millimeter.The large antenna panel deformation dynamic monitoring system can be completed within one hour from data acquisition to data processing to derive antenna deformation variables. The photogrammetry method, total station method and radio holography method in the process of large antenna panel deformation measurement, data acquisition all need one or two hours, as well as the subsequent data processing also need a long time, 3D laser scanner measurement of antenna panel deformation only need one hour to complete data acquisition and analysis, to achieve high efficiency of antenna panel deformation monitoring. The 3D laser scanner has reliable single point measurement accuracy and surface measurement accuracy, and the reliability of single point accuracy is verified by total station, and the 3D laser scanner measures antenna panel deformation to sub-millimeter accuracy, which realizes high precision antenna panel deformation measurement. The processing algorithm of the antenna panel point cloud data has been integrated, from data acquisition to data processing, with simple operation and automated deformation monitoring. The LAP3D constructed in this paper can obtain the sub-millimeter scale deformation of large antenna panel with 70 m aperture. Compared with the traditional measurement methods to obtain the antenna panel deformation, the measurement efficiency is greatly improved while the measurement accuracy is not reduced, and the measurement and analysis functions of the antenna panel data under different pitch angles can be completed quickly.