The retention of fault waterproof coal pillars can effectively ensure the safe mining of coal resources in mines, but it also causes a large amount of waste of coal resources. Especially in Xingtai mining area, the fault structure is developed, and the waste of coal pillar resources is particularly obvious. With the increase of mining years, the reserves of coal resources decrease sharply. It is the most direct way to extend the mine life that how to liberate the fault waterproof coal pillar resources safely and effectively. Based on the discussion of ground exploration, the fault is reinforced by grouting in this paper through adopting the comprehensive water prevention and control technology combining underground geophysical exploration and drilling exploration, which completely cut off the upward hydraulic connection of the coal seam floor aquifer. The study safely liberated the fault coal pillar resources.