<p>The current study found that when landslide deformations occur near water bodies such as reservoirs, lakes, or rivers, they may trigger massive surge waves, leading to secondary disasters and threatening the safety of the hydraulic projects and human lives. As such, the landslide deformation and surge problems aroused widespread public attention. In this paper, a novel numerical analysis method for landslide deformation and its surge waves is presented. Primarily, the high-precision three-dimensional calculation model construction method based on Unmanned Aerial Vehicle (UAV) photogrammetry technology is proposed. To enhance the precision and efficiency of image matching, the Scale-Invariant Feature Transform (SIFT) algorithm is enhanced by using the Improved Random Sample Consensus (IRANSAC) algorithm, achieving more accurate image alignment. With the demands of simulating the complicated deformation and sliding process of landslides, the material point method is introduced subsequently. Finally, an actual landslide in China served as an example to verify the simulation effect. The research result demonstrates the superiority of the proposed method in analyzing the deformation and surge waves of landslides, which provides a feasible way to analyze the dynamic processes of landslide deformation and its generated surge waves. On this basis, the proposed method contributes to risk management of landslide deformation and its surge waves.</p>