Abstract: In order to more intuitively and scientifically study and analyze the development law of overlying strata fractures in thick coal seam under strong mining and the enrichment characteristics of high-concentration pressure relief gas in the overlying strata fracture field, this paper takes 2407 working face of Yuhua Coal Mine as the experimental object. Based on the classical theory of overlying strata fracture field and the migration mechanism of pressure relief gas, the multi-functional intelligent drilling detection method is used to accurately detect the enriched area of pressure relief gas in overlying strata under strong mining in thick coal seam of Yuhua Coal Mine. The results show that the fracture evolution pattern of mining-induced fracture area is mainly the lateral separation fracture evolution of rock strata. With the advancing, vertical fracture and transverse separation cracks occur between rock strata, forming a crisscross fracture network. The technology optimizes and expands the analysis method of pressure relief gas enrichment law in the fracture field with strong mining in thick coal seam, and guides engineering practice of gas drainage and extraction in pressure-relief gas-rich areas by high-level large-diameter boreholes.