TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: The to-be-treated kitchen waste comprises kitchen waste, fruit and vegetable waste and/or food waste in food and drink industry, and waste having high organic nutrient content and contains municipal sludge. The method further involves performing magnetic selection by recycling metal impurities in rough particles processed by step (a) and delivering and landfilling the remaining rough sundries. The method further involves pulverizing the kitchen waste slurry by passing kitchen waste into separating machine and delivering and landfilling the separated inorganic impurities and/or impurities not easy for anaerobic digestion. The anaerobic fermentation is performed by conducting intermittent mechanical stirring and external cycling pump fluid stirring to materials inside the anaerobic digestion device. The solid containing rate in kitchen waste slurry when conducting anaerobic fermentation is 8-10% and digestion temperature is 35 plus minus 2 degrees C. The anaerobic digestion device charges for 1-8 times/day and staying time is 20-25 days. The method involves monitoring varied parameters in anaerobic fermentation process, where the parameters are basicity, pH value, volatile aliphatic acid density, ammonia nitrogen density, methane yield and methane content in methane, and adjusting the anaerobic fermentation control condition according to the detecting data to reach stable and efficient digestion efficiency. The method further involves pretreating the methane liquid by pumping methane into methane liquid buffer pool, adjusting rational property of the methane liquid to meet the requirements of the evaporation concentration and stabilizing the fertilizer effect constituent of the liquid fertilizer. The evaporation concentration treatment is performed by mechanical steam compression evaporation method. The method further involves performing evaporation distilled water treatment by conducting the ion exchange device treatment to distilled water after the evaporation concentration treatment into soft water, where the soft water returns to the homogeneous pool used for adjusting the water content in the kitchen waste slurry of the homogeneous treatment or used for water cleaning the workshop, equipment and/or reserve water. ACTIVITY - Fertilizer.