Composite soil remediation agent and preparation method thereof

The invention provides a composite soil remediation agent which comprises a microbial organic fertilizer, a phosphate material and the balance of a biological fermentation substrate, and the mass ratio of the microbial organic fertilizer to the phosphate material to the biological fermentation substrate is 1: 72. 27; microorganisms in the microbial organic fertilizer are compound bacteria, and the compound bacteria comprise aspergillus niger, yeast fungi and bacillus. The invention further provides a preparation method of the composite soil remediation agent. The prepared composite soil remediation agent combines the phosphate solubilizing capacity of the aspergillus niger, the heavy metal adsorption capacity of the yeast, the phosphate solubilizing effect of the bacillus and the phosphorus source of the phosphate, and the composite remediation agent has the advantage of releasing available phosphorus for a long time through the microbial organic fertilizer technology. 本发明提供一种复合土壤修复剂，包括微生物有机肥和磷酸盐材料，余量为生物发酵基质，