NOVELTY - The method comprises taking the garbage as raw material, crushing the raw material, stewing the crushed material at 100-160 degrees C and then extracting grease, putting a pre-treated material into an adjusting pool at 40-70 degrees C and then adjusting the temperature of 80-100 degrees C and the pH of 3.5-4.5, putting the material into a fermentation tank for anaerobic fermentation for 15-20 days, controlling the temperature of 30-60 degrees C and the pH of 7-8, introducing the fermented material into a second level fermentation tank to ferment for 10-15 days, and controlling the temperature of 30-60 degrees C.    USE - The method is useful for anaerobic fermentation of kitchen garbage, which is useful for producing marsh gas.    ADVANTAGE - The method allows simple, effective and anaerobic fermentation of kitchen garbage in an environmentally friendly manner.    DETAILED DESCRIPTION - The method comprises taking the garbage as raw material, crushing the raw material, stewing the crushed material at 100-160 degrees C and then extracting grease, putting a pre-treated material into an adjusting pool at 40-70 degrees C and then adjusting the temperature of 80-100 degrees C and the pH of 3.5-4.5, putting the material into a fermentation tank for anaerobic fermentation for 15-20 days, controlling the temperature of 30-60 degrees C and the pH of 7-8, introducing the fermented material into a second level fermentation tank to ferment for 10-15 days, controlling the temperature of 30-60 degrees C and pH of 7-8, flowing the fermented material from a top of the second level fermentation tank into a comprehensive pool, pumping the supernatant liquid processed by the comprehensive pool into the methane reinforced lifting reactor, controlling the temperature at 30-40 degrees C and pH of 7-8, and collecting marsh gas by generating marsh gas from the first-level and the second-level fermentation, introducing gas through a marsh gas pipe, gathering the marsh gas through each branch tube into the main pipe, allowing the marsh gas into the water seal liquid level of 30 cm and then into a spray tower, washing the impurity of marsh gas, carrying out desulfurization to the washed marsh gas using alkali solution, allowing the marsh gas into the dewatering device, removing the water in the gas, introducing the gas into a marsh gas film and into a compressor to stir the gas in the fermentation tank, and collecting the whole marsh in a system, which is equipped with a pressure control system, a gas alarm controller, a marsh gas flow meter, a biogas burning torch and a marsh gas lamp. The raw material is feeding at a speed of 10-20 m3/hour.