NOVELTY - Treating refuse leachate through photoelectric Fenton oxidation reaction based on modified gas diffusion electrode comprises taking 2-ethylanthraquinone modified gas diffusion electrode as cathode, obtained by photovoltaic Fenton reaction device; connecting the gas diffusion electrode between the liquid chamber and the gas chamber and the reaction device; passing leachate liquids into gas chamber through the oxygen-containing gas, irradiating using ultraviolet light, adding ferrous ion and carrying out photoelectric Fenton reaction and degradation of organic waste.    USE - The method is useful for treating refuse leachate through photoelectric Fenton oxidation reaction based on a modified gas diffusion electrode (claimed).    ADVANTAGE - The method and device increase degraded efficiency of organic waste in the landfill leachate.    DETAILED DESCRIPTION - Treating refuse leachate through photoelectric Fenton oxidation reaction based on a modified gas diffusion electrode comprises taking 2-ethylanthraquinone modified gas diffusion electrode as cathode, obtained by photovoltaic Fenton reaction device; connecting the gas diffusion electrode between the liquid chamber and the gas chamber and the reaction device; passing the leachate liquids into the gas chamber through the oxygen-containing gas, irradiating using ultraviolet light, adding ferrous ion and carrying out photoelectric Fenton reaction, degradation of organic waste to obtain landfill leachate. An INDEPENDENT CLAIM is also included for device, comprising a stirring device, a liquid chamber electrolytic cell, an anode, an ultraviolet lamp, 2-ethyl-anthraquinone modified gas diffusion electrode, a cell gas chamber, an inlet, an outlet, a direct current power supply, and an oxygen-containing gas; where the anode and 2-ethylanthraquinone modified gas diffusion electrodes are connected to the direct current power supply; where the ultraviolet lamp is placed in the liquid chamber electrolytic cell and fixed; and the landfill leachate is placed in the liquid chamber electrolytic cell.