Soil leaching technology refers to injecting or infiltrating a solvent that can promote the dissolution or migration of pollutants in the soil into the contaminated soil layer, allowing it to pass through the contaminated soil and desorb, chelate, dissolve or complex with the pollutants. Chemical reaction, which eventually forms a migrating compound, and then uses extraction wells or other means to extract the liquid containing contaminants from the soil layer for processing.It mainly includes: applying leachate to the soil, collecting the lower leachate and treating the leachate.