To suppress elution of harmful materials existing as an anion from contaminated soil.SOLUTION: There is provided a processing method of contaminated soil for treating the contaminated soil contaminated with harmful materials, having a first process for adding a chelator to the contaminated soil and cleaning the same, a second process for adding a solution containing at least one of iron (III) and magnesium (II) to the contaminated soil after the first process and cleaning the same, and a third process for adding water to the contaminated soil after the second process and cleaning the same.SELECTED DRAWING: Figure 1
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