The invention discloses a heavy
metal contaminated
soil remediation agent. The remediation agent is prepared from the following raw materials in parts by weight: 100-200 parts of
humic acid, 50-100 parts of
biochar, 20-30 parts of composite minerals, 1-5 parts of a compound
enzyme preparation and 1-5 parts of a compound
microbial agent. The preparation method comprises the following steps:(1)weighing the raw materials;(2)mixing the
humic acid, the
biochar and the composite minerals, crushing, sieving, adding water, heating, stirring, and cooling to obtain a mixture A for later use;(3)mixing the compound
enzyme preparation and the compound
microbial agent, adding water and a
carbon source, and performing habituated culture to obtain a mixture B; and(4)uniformly mixing the mixture A and themixture B, and
drying to obtain the product. According to the remediation agent, mild enzymes and microbial strains are adopted for treating soil, heavy
metal and
pesticide residues are degraded and adsorbed, and the
soil quality condition of the soil is obviously improved.