The invention relates to a remediation conditioner for chromium-contaminated soil and a remediation method adopting the remediation conditioner. The remediation conditioner comprises raw materials in percentage by weight as follows: 5%-25% of ferrous sulfate, 5%-25% of calcium polysulphide, 5%-30% of humic acid resin, 1%-2% of cow dung and 1%-25% of fungus residues, wherein the humic acid resin is prepared from sulfonated sodium humate, phenol-formaldehyde resin and calcium acetate through activation after crosslinking and curing. The remediation conditioner adopts a simple formula, is mainly used for remediating soil by removing chromium, has high chromium VI removal rate, can increase content of residual-form chromium, can improve the soil quality and improves the sustainable utilization capacity of the soil.