On June 24, 2017, a catastrophic landslide occurred in Maoxian County, Sichuan, China, burying an entire village and more than 100 people. We focused on mapping and predicting the deformation in Maoxian before the landslide based on 39 C-band synthetic aperture radar images acquired by the Sentinel-1 satellite. In order to identify sufficient measurement points in rural areas, the images were first filtered with joint scatterer interferometric synthetic aperture radar to increase the number of measurement points 20 times. Then, the cumulative time series deformation in the landslide area from November 7, 2014, to June 12, 2017, was obtained by employing a time series InSAR technique combined with an unscented Kalman filter (UKF) to predict the deformation by separating the prediction and update steps. Approximately, 30 suspected landslide points were found in the area. Qualitative and quantitative analyses of the experimental results suggested that combining time series InSAR with UKF can be used to predict deformation trends with millimetric accuracy at a large scale before landslides occur.