Hydrogeological conceptual and mathematical models were established by Visual Modflow, then taking Daheng coal mining as an example to explore the impacts on groundwater level and quantity in Shuozhou City of Shanxi Province. We conducted an investigation of water level in wells within the scope of 50 km² around the mining boundary. According to the mining time of each mining district, and combining with the regional groundwater buried depth and regional stratigraphic trend, as well as the monitoring results of the well water level during various periods within the scope of investigation, a model on Daheng coal mining and verification of the accuracy of the model was constructed. The result showed that the coal mining of Daheng mine will cause the cone of depression 28.8 years after mining, which has an area of 9.5 km² and depth of 55 m. It indicated that coal mining will make the overlying aquifer drawdown and the formation of the cone of depression.