NOVELTY - Treating kitchen waste, urban manure and municipal sludge, comprises e.g. adding the kitchen waste into a discharge port, sorting, crushing, pulping to obtain slurry, performing three phase separation by heating the slurry, and centrifuging to separate oil, dreg and water; separating the solid inorganic residue of urban manure; crushing the municipal sludge into a homogenate; adding the pre-processed kitchen waste slurry, urban manure slurry and municipal sludge material into a slurry storage device; performing anaerobic fermentation, and purifying the fermentation biogas.    USE - The method is useful for treating kitchen waste, urban manure and municipal sludge.    ADVANTAGE - The method achieves degradation rate of more than 80% of organic substance in waste.    DETAILED DESCRIPTION - Treating kitchen waste, urban manure and municipal sludge, comprises: (i) adding the kitchen waste into a discharge port, sorting with a thick grid of 60 mm, picking out kitchen waste having inorganic residue of less then 60 mm and passing into landfill field for processing, allowing the kitchen waste of less than 60 mm to pass through a thick grizzly screen into crusher, and crushing with a crusher blade to 12 mm, pumping the crushed kitchen waste into a pulping device provided with a rotary drum grid and a horizontal shaft-free spiral conveyor, collecting and separating the surface material, precipitating and separating heavy impurities to obtain slurry and passing the slurry into a three phase separator, performing three phase separation by heating the slurry in a steam heater to about 50 degrees C, and centrifuging to separate oil dreg and water, passing the oil through a oil-water separator to prepare industrial grease, passing the solid phase and aqueous phase into a screw conveyor for hydration and pulping into 80-100 meshes slurry, and obtaining a homogenate; (ii) separating the solid inorganic residue of urban manure in a solid-liquid separation device in landfill, where the total weight of solid material in solid inorganic residue is 55-70%, and liquid phase after slurry pulping mechanism has less the 5% of solid material; (iii) crushing the municipal sludge into a homogenate; (iv) adding the pre-processed kitchen waste slurry, urban manure slurry and municipal sludge material into a slurry storage device, adjusting the solid content in the slurry to be 8%, adjusting the liquid by reflux biogas slurry, sewage or tap water, where the slurry storage device is provided with a tapered bottom sedimentation silt for periodically desilting row of sand via port, a heat insulating device, and the device temperature is 35-38 degrees C, the liquid pH is controlled at 6.5-8.5, by controlling the temperature and pH value on-line monitoring, the slurry is allowed to stay for 1 day in slurry storage device; (v) passing the slurry from the slurry storage device into an anaerobic fermentation device, where the anaerobic fermentation device is completely a mixed-type cylindrical fermentation tank, whose bottom is plane, and the tank body is a concrete sealing structure, the upper part of the fermentation tank is equipped with a slag removing device and a hood, processing the collected biogas, and allowing to stand in the fermentation tank for 21 days, maintaining the fermentation tank internal temperature at 35 degrees C, arranging an insulation device and a temperature compensation device at the outer surface of the fermentation tank, where the heat is supplied to the temperature compensation device heated by a boiler system, mechanically stirring the slurry, controlling the process by maintaining a slight overvoltage condition inside the fermentation tank, setting a detecting device inside the fermentation tank, maintaining internal pressure value in the fermentation tank, measuring and monitoring the methane and carbon dioxide content index, setting an automatic control system, feeding the material into the fermentation tank, stirring, adjusting the pH value, online testing and monitoring the temperature, periodic sampling of volatile acid, and ammonia nitrogen for laboratory testing, semi-continuously feeding and discharging in the fermentation tank, where the discharging time and discharge quantity is same as the feeding time and feeding quantity, providing a control valve for naturally discharging under gravity, and discharging the fermentation residue into the sludge storage device, (vi) passing the biogas ferment residue into a dehydrating system, dehydrating the biogas residue until moisture content is 72-75% and obtaining compost organic fertilizer, passing the fermentation biogas and biogas dehydration waste part of the aeration to the homogenate adjustment process, and discharging the redundant part after sewage treatment; and (vii) purifying the fermentation biogas in moderate fermentation temperature, performing pressure swing adsorption (PSA) decarburization, and transporting to biogas users.