In order to study the influence of heightening tailings dam on the migration of Cu2+ in the tailings pond, the numerical simulation was carried out by GeoStudio software in Waitoushan tailings pond. The tailings pond models with different dam heights were established. The equipotential diagrams of pore water pressure and heavy metal concentration distribution and the diagrams of particle migration path with different dam heights were obtained. The results showed that the pore water pressure at thesame position increased with the height of the tailings dam. At the same depth of the tailings dam, the concentration of Cu2+ and the migration distance of pollutants increased with the height of tailings dam. After migration for the same time, the mass concentration of heavy metal pollutants at the same depth increased with the height of the tailings dam. The migration distance and average migration speed of pollutant particles increased with the height of the tailings dam.