The invention provides
soil washing liquid which comprises a solute and a
solvent. The solute comprises p-methoxyphenol,
potassium persulfate and
oxalic acid, and the
solvent is water. According to the
mass percent, the p-methoxyphenol ranges from 5.4% to 5.8%, the
potassium persulfate ranges from 2.2% to 2.8%, and the
oxalic acid ranges from 1% to 2%. According to the
soil washing liquid, the p-methoxyphenol is used for absorbing organic contaminants in soil through a
chemical reaction and is combined with a brand-new, efficient and full-function
soil remediation agent through chemical bonds,the contaminants are removed, effective
organic matter in the soil is increased, and the p-methoxyphenol can be utilized by probiotics in the soil; meanwhile, the
potassium persulfate and the oxalicacid can absorb heavy
metal in the soil, the
oxalic acid can be used for adjusting the pH value of the
soil washing liquid, and the p-methoxyphenol can be combined with the organic contaminants more easily so as to achieve the optimal effect; and in addition, the excessive part can be used as nutritional ingredients to improve the
fertility of the soil, and the defects that existing soil washing liquid is narrow in treatment application range, and soil with the soil washing liquid recycled cannot be used for cultivating are overcome.