[Objective] Land subsidence is one of the main geological hazards in coal mine area, which seriously affects the sustainable development of mining economy and the safety and stability of residents' life. It is necessary to monitor the land subsidence in the mining area quickly and efficiently. [Methods] The 31 scenes Sentinel-1 images of Datong coalfield acquired from January 2020 to December 2021 were used to monitor the land subsidence based on Small Baseline Subset InSAR (SBAS-InSAR) technology. The land subsidence rate and cumulative subsidence results of Datong coalfield were obtained. Moreover, the reliability of the monitoring results were verified using existing research results, and the spatiotemporal variation characteristics and evolution laws of subsidence were analyzed. [Results] The results show that the land subsidence in Datong coalfield is widely distributed, and the overall distribution of subsidence is basically consistent with the trend of mining management data in Datong coalfield. The subsidence is mainly distributed in the west of Nanjiao County of Datong City and the junction of Datong City, Huairen City and Shanyin County, among which the land subsidence of Tashan mine is the most serious. The subsidence characteristics of Datong coalfield mainly include the maximum subsidence rate of 168.03mm/y, the maximum cumulative subsidence amount of 329.12mm, and the total subsidence area of 270.95km2. Overall, the subsidence shows a trend of continuous increase, it takes a long time to realize the relative stability of surface activities according to the subsidence trend. [Conclusions] The study shows the feasibility of InSAR technology in subsidence monitoring in coal mine area, which can provide a new technical for mineral resources management work, and the research results can provide scientific basis for subsidence monitoring and warning, disaster prevention and control, and rational development and utilization of resources in coal mine area.