Soil conditioner as well as preparation method and application thereof

The invention provides a soil conditioner as well as a preparation method and application thereof, and belongs to the technical field of soil remediation. The wormcast and the microbial inoculation liquid are added into the minerals or the biochar, the specific surface area and polarity of the minerals and the biochar and the number of oxygen-containing functional groups can be increased after culture, then the adsorption capacity of the minerals and the biochar to heavy metal ions is improved, and the efficiency of repairing the heavy metal contaminated soil through the minerals and the biochar is improved; meanwhile, the content of available N in minerals and biochar is increased, microbial activity is facilitated, harmful substances in soil are degraded, and crop growth is facilitated. 本发明提供了一种土壤改良剂及其制备方法和应用，属于土壤修复技术领域。本发明在矿物或生物炭中添加蚯蚓粪以及微生物接种液，培养后能够提高矿物、生物炭的比表面积和极性以及含氧官能团数量，进而提高矿物、生物炭对重金属离子的吸附能力，提高了矿物、生物炭修复重金属污染土壤的效率，同时提高了矿物、生物炭中可利用N含量，有利于微生物活动，降解土壤中有害物质的含量，并且有利于作物生长。