Abstract: Reducing the source of acid mine drainage is very important for the ecological restoration of acid mines and tailings dumps, the research and development of earthen cover constructed with solid wastes is of great scientific and engineering value for achieving seepage prevention, oxygen barrier and reducing generation of acidic mine drainage. In this paper, typical solid wastes are used to construct a composite earthen cover, and its performances in reducing water percolation and oxygen entry are also studied through soil column test and field demonstration. Soil column test results show that the oxygen flux of this earthen cover is 0.48 mol/(m²·a); no bottom leakage is found in the cover after applying an extreme rainfall with 50-year return period in the humid area of southern China. Thereafter, the first full-scale test of earthen cover constructed using solid wastes is built in acid mining dumps. During the one-year monitoring period, the total rainfall is 1193.2 mm, and the cumulative leakage is 20.0 mm. The oxygen flux during monitoring is 0.75 mol/(m²·a). The revegetation in the experimental area is 100%. These results show that the earthen cover constructed with solid wastes has broad application prospects in reducing water percolation and oxygen entry at the base of the cover in acid solid waste dumps, leading to a significant reduction of acid mine drainage.