Abstract: In view of problems such as difficulty in verifying reliability of research results, the single method is often used to study distribution law of hydrogen sulfide (H2S) concentration in fully mechanized caving face of coal mine, taking a coal mine working face in Shaanxi as research background, H2S concentration distribution and dynamic movement law of the working face is studied using Fluent software to build a numerical simulation model.Measurement points are arranged on the working face, and H2S concentration in the working face is measured on site with a CD4 gas detector. Both numerical simulation and field measurement results show that in the vertical direction, as the height from the floor increases, the H2S concentration first increases and then decreases; in the horizontal direction, as the distance from the coal wall of the working face increases, the H2S concentration gradually decreases; in the wind flow direction, as the distance from the shearer increases, the H2S concentration gradually decreases. The numerical simulation results are consistent with the field monitoring results, verifying feasibility of the numerical simulation method and providing reference for the field H2S movement law research.