Abstract: Based on a certain coal mine in Shanxi Province as the engineering background, this paper studies the reasonable offset distance and the overburden movement law of the adjacent coal seam co-mining face through theoretical analysis and numerical simulation methods. Through theoretical analysis, combined with the pressure stabilization zone theory, a calculation model for the minimum offset distance of the adjacent coal seam co-mining face is established, and the minimum offset distance is obtained as 29.1 m. Through numerical simulation, the overburden stress distribution and movement law under different offset distances are analyzed. The results show that when the offset distance is 20 m, the controlled roof area of the lower coal seam is completely within the influence range of the upper coal seam mining; while when the offset distance increases to 35m, the influence of the upper coal seam on the lower coal seam is basically eliminated, and the stress concentration degree and subsidence of the overburden are significantly reduced. Further analysis reveals that the interlayer rock strata support stress presents two peaks respectively in front of the upper and lower coal seam working faces. As the offset distance increases, the stress change gradient between the two peaks gradually becomes gentler, and the stability of the interlayer rock strata is enhanced. When the offset distance exceeds 35 m, the roof subsidence significantly decreases. Based on the comprehensive theoretical analysis and numerical simulation results, it is determined that the offset distance of the co-mining face in actual mining is 35 m.