For the Pangcun Landslide in Tibet, where cracks were found in April 2019 and continued to increase in size, posing a serious safety threat to nearby villagers and infrastructure, 75 scenes of Sentinel-1A descending track data from January 3, 2018 to July 3, 2020 were collected, and the surface deformation information of the landslide during this time period was obtained by using the small baseline subset-interferometric synthetic aperture radar (SBAS-InSAR) technique; feature points were selected in the area with large deformation variables, and the deformation variables were analyzed. The accuracy of the interpretation results is verified. The results show that: the maximum deformation rate of Pangcun landslide is -38 mm/y in the selected time period; there are obvious dividing lines of landslide deformation, which can be divided into three different sliding zones; there is an obvious acceleration of landslide deformation in two time points, December 2018 and October 2019; the accuracy verification with ground monitoring data shows that: the landslide deformation shown by SBAS-InSAR interpretation results and ground The consistency of the temporal and spatial characteristics of landslide deformation shown by the monitoring results verifies the effectiveness of SBAS-InSAR technology using Sentinel-1A data in the monitoring and management of mega-landslides, which provides a reliable technical basis for the management of landslides.