Method for repairing heavy metal contaminated soil

The invention relates to a method for repairing heavy metal contaminated soil. According to the method, organic acid and a seaweed organic polymer oxidant are utilized to realize reduction conversionof heavy metals in the soil, and a seaweed organic polymer energy agent is utilized to realize flocculating settling of the heavy metals. The method for repairing the heavy metal contaminated soil hasthe beneficial effects that the form of the heavy metals can be effectively changed, the proportion of the stable state of the heavy metals is increased, and the mobility, solubility and bioavailability of the heavy metals are reduced; only organic substances are used for reducing, stabilizing and settling heavy metal pollutants, especially heavy metal cadmium and hexavalent chromium, in farmlandsoil, the cultivation function of the soil is not damaged, the side effect of soil hardening is avoided, and secondary pollution is avoided; and the method is short in treatment time, quick in effect, easy to operate and appli