NOVELTY - The processing method comprises performing solid-liquid separation step comprising sorting out the impurity of the kitchen garbage through centrifugal separation method and then separating the liquid and solid in kitchen garbage from each other, performing oil extracting liquid phase step comprising extracting liquid phase oil by gravity extraction method and then extracting the liquid phase oil residual liquid to subsequent reinforced slurry with solid phase oil extracting process, and crushing device for solid waste of the solid-liquid separation process of the separated solid.    USE - The processing method is useful for extracting grease from kitchen garbage.    ADVANTAGE - The processing method is capable of simply, efficiently and economically extracting grease from kitchen garbage with less energy consumption.    DETAILED DESCRIPTION - The processing method comprises performing solid-liquid separation step comprising sorting out the impurity of the kitchen garbage through centrifugal separation method and then separating the liquid and solid in kitchen garbage from each other, performing oil extracting liquid phase step comprising extracting liquid phase oil by gravity extraction method and then extracting the liquid phase oil residual liquid to subsequent reinforced slurry with solid phase oil extracting process, crushing device for solid waste of the solid-liquid separation process of the separated solid after mechanically crushing the subsequent reinforced slurry with solid phase oil extracting process, reinforcing slurry with solid phase oil extracting, crushing waste in the container ferment liquid and water close to the mixed material, heating the material at 35-55 degrees C in a sealed container, and separating out solid phase oil and grease extracted by centrifugal extracting and grease collect. The solid-liquid separation step is performed by multi-stage spiral conveying and lifting way in the reinforced slurry with solid phase oil extracting process. The multi-level spiral conveying and lifting is closed multi-level spiral conveying and lifting device. The solid-liquid separation device has porosity of less than 5 mm. The material particles after mechanical crushing process are less than 5 mm. The reinforced slurry has solid content of 8-12%. The processing method further comprises handling arrangement for high temperature hydrolyzing the kitchen garbage material to reinforce the homogenate with the pre-processing in the heat preservation condition oil extraction process for hydrolyzing, where the macromolecular organic substance is micromolecule organic matter, performing hydrolysis process at heat preservation temperature of 35-55 degrees C for 1-3 days, and performing anaerobic fermentation process at 35 degrees C or 55 degrees C.    DESCRIPTION OF DRAWING(S) - The diagram shows a flow chart of a processing method (Drawing includes non-English language text).