Abstract: Heavy metal pollution is one of the serious problems facing the global environment, and in the major mining tailings in the surrounding soil and groundwater contamination is particularly significant. The large number of tailings and huge, mine is one of the important facilities and heavy metals gathering. This paper based on the finite element analysis software, the establishment of a numerical model simulation of the tailings seepage, has been steady seepage field. The migration law of heavy metal pollutants was simulated, and the pollutant diffusion maps at 5, 15, and 30 years under steady-state seepage were obtained. At the same time, the barrier of the sewage barrier at 0.2 m and 0.5 m thickness was simulated, and the effect of blockage of pollutants was obvious. With the passage of time, the blockage effect of 0.5 m engineering barrier was more significant. By tailings heavy metal diffusion barrier and engineering numerical simulation analysis, to provide effective prevention ideas for the mine environment pollution problems.