Abstract: The land subsidence in the Beijing-Tianjin-Hebei (BTH) region has developed the most rapidly and affects the largest area in China and it has become an unnegligible geological problem in the coordinated development of the BTH region. In this study, the multi-track Sentinel-1A data from January 2016 to October 2018 that cover the whole BTH plain was processed using the multi-temporal InSAR (MT-InSAR) technique. After the verification using leveling data and the cross-validation using the data from adjacent tracks, the land subsidence in the BTH region during 2016—2018 were obtained by integrating multi-track SAR data results. The InSAR monitoring results show that the maximum subsidence rate in the BTH region reached 164 mm/a and the land subsidence was widely and unevenly distributed in space in the study area during the monitoring period. According to the analysis of the spatial-temporal change characteristics of the land subsidence in the BTH region, the land subsidence showed an increasing trend in the Tangshan-Qinhuangdao area but stably developed in the remaining areas in the BTH region during 2016—2018. This paper demonstrates that the reliability of the InSAR technique in the monitoring of land subsidence in large regions. The results of this study will provide an important basis for the prevention and mitigation of regional subsidence and will provide a scientific guarantee for the construction of the BTH urban agglomeration.