Prediction of mine drainage and precipitation is very important for the construction of mine. The amount of drainage and precipitation changes continuously with the progress of mining. It is difficult for traditional analytical methods to combine drainage and precipitation with the progress of mining. The Drain sub-module in the VisualModflow 3D numerical simulation software was used. Based on the Zone Budget module, the dredging and dewatering volume was combined with the mining progress of the working face. The quantity was dynamically predicted, which provided a theoretical basis for the formulation of mine water-proof and drainage measures.