Method for circularly repairing heavy metal contaminated soil by comprehensively utilizing willows and derivatives thereof

According to the method for circularly repairing the heavy metal contaminated soil by comprehensively utilizing the willows and the derivatives thereof, the willows and the organic leacheate are used for cooperatively treating the heavy metal contaminated site, the repairing efficiency of repairing the heavy metal contaminated site by utilizing the willows is improved, and the repairing time can be shortened to 2-3 years; however, the traditional method for repairing the heavy metal polluted site by the willow generally needs 6-10 years, so that the time for repairing the heavy metal polluted site by the willow is greatly shortened. Meanwhile, waste such as trees and leaves generated in the process of repairing the heavy metal polluted site through plants is effectively utilized, willow coarse wood block particles, fine particle compost, biochar and organic leacheate obtained through fermentation are reused in site repairing, the willow coarse wood block particles, the fine particle compost, the biochar and t