In this paper, the application of Iron(II) sulfate and hydrogen peroxide oxidation processes for stabilized landfill leachate treatment was investigated. The leachate came from a municipal sanitary landfill and the average values of its main parameters were: pH 7,95; COD 840 gO₂/m³; BOD 60 gO₂/m³; NH₄⁺ 110 gN/m³; conductivity 6,05 mS/cm; UV254 absorbance 0,32 and turbidity 1,3 NTU. It is demonstrated that the application of Iron(II) sulfate and hydrogen peroxide can effectively remove leachate pollutants such as color, COD and UV254 absorbance. A combination process, accomplished at different weight ratios of reagents H₂O₂/Fe was 1,6 to 32,4. The best conditions for process were found at a ratio Fe/COD equal to 0,71 and H₂O₂/Fe equal to 5,4. Leachates were significantly oxidized under these conditions in terms of COD removal 74,1%, color removal 94,5% and UV254 absorbance removal 88%.