In this paper, the research of landslide deformation is taken as the starting point, the advantages and disadvantages of various measurement technologies are described, the principle, composition and advantages of UAV photogrammetry technology are briefly introduced. The latest research progress of landslide deformation observation based on UAV photogrammetry technology is described in detail, the existing problems of this technology and the better solutions at present are pointed out. Finally, the application of UAV Photogrammetry in landslide deformation observation is prospected, which provides the latest research progress and ideas for researchers in related fields in the future.