Abstract: Water inrush in coal mine is a major hidden danger threatening coal mine mining. Quantitative evaluation of water inrush risk in coal mine floor can predict the severity of water damage in time and improve the level of water damage prevention in coal mine. This paper takes a coal mine in Jining City, Shandong Province as an example. Based on the various main indicators that affect mine water inrush, the weights of each indicator are determined by combining the AHP method and entropy weight method. The TOPSIS approximation ideal solution ranking method is used to calculate the risk level of water inrush in the working face of a coal mine in Jining City, Shandong Province. The evaluation results are basically consistent with the actual situation of the mine. This method considers all kinds of risk factors affecting water inrush of coal seam floor comprehensively, and the determination of index weight comprehensively considers the subjective experience of experts and the objective law of drilling data. It provides a reference for the risk assessment of water inrush before mining.