Remediation method of heavy metal contaminated soil

The invention discloses a remediation method of heavy metal contaminated soil, wherein the method is convenient for targeted treatment according to the characteristics of the contaminated soil by marking the contaminated soil according to different pollution degrees. Biochemical solvent spraying treatment is carried out on severely polluted surface soil, the treated surface soil is replaced with bottom soil, microbial communities are filled in the treated surface soil, so as to achieve the purpose of repairing the soil layer by layer, and the soil is further repaired in combination with sowing green grass as a fertilizer and planting sunflowers which are effective for repairing the soil; and secondly, pollutants in the bottom soil and the surface soil can be prevented from permeating into a deeper soil layer under the action of the plastic film laid in a soil pit before replacement; the polluted soil can be subjected to targeted layering treatment in this way, the remediation efficiency is effectively improve