Advanced oxidation technology based on sulfate radicals is widely used in environmental pollution control with high efficiency and low pollution. In this paper, the system was used to repair soil. Experimental study was carried out in the aspects of the Na₂S₂O₈/Fe²⁺ molar ratio, the pH value of the system and the dosage of Na₂S₂O₈/Fe²⁺. The results show that, when the molar ratio of Na₂S₂O₈/Fe²⁺ is 2:3, the degradation effect of oil pollutants is the best, and the pH value of the system has little effect on the degradation effect. The optimal amount of sodium persulfate and ferrous sulfate solution with 0.1 mol/L concentration is 2 mL and 3 mL in 1 g soil, the degradation effect of No.2 soil is most obvious. Therefore, the amount of contaminated soil per ton is about 2×10⁶ mL, 3×10⁶ mL.