Water retaining method for coal mining process

The invention discloses a water retaining method for a coal mining process, relating to the technical field of an underground mining method. The water retaining method comprises the following steps: firstly, performing three-dimensional probing on underground water static occurrence features, protective layer integrity and natural water diversion channel development state of an underground coal mine excavating region by adopting the three-dimensional probing technique; and secondly, finding a weak section and a water diversion channel in an underground water protective layer and a section with underground water leakage risk by combining the probed result, and rapidly grouting to block the water diversion channel and the section with the underground water leakage risk by drilling rapidly and accurately and grouting to reinforce the underground water protective layer or setting up a water retention coal pillar by adopting underground high-pressure water jet drilling technology. The method can realize protection to groundwater resources in mining districts while ensuring safe and high-efficiency coal mining.