Aiming at the Dakuaitian landslide in the Three Gorges reservoir area, which appeared cracks in July 2021 and intensified deformation in August, causing serious safety hazards to local villagers and infrastructure, 9-view Sentinel-1A uplift SAR image data from March 2021 to August 2021 were used as data sources to obtain the time-series deformation characteristics of the landslide in this time period by using SBAS-InSAR technology, and compared with the concurrent GNSS monitoring and geological exploration data. The results show that the deformation of the middle and rear part of the landslide is obvious and is in the state of creeping deformation; The signs of landslide deformation are in good agreement with the InSAR results, which verifies the effectiveness of SBAS-InSAR technology in landslide monitoring; The accumulated rainfall in the previous period and the short-time intense rainfall are the main factors that induce the current deformation of Dakuaitian landslide. This study shows that the SBAS-InSAR technology has a broader application prospect in the field of geological disaster monitoring and early warning in the Three Gorges reservoir area, and provides a reference for similar reservoir area landslide deformation monitoring and early warning.