NOVELTY - Comprehensive utilization method for harmless treatment of kitchen waste, comprises sorting kitchen waste, sorting on a solid-liquid separation platform through a vertically set screen, where the collected liquid part flows into an oil-water separation system platform, and crushing solid part is by a crusher, allowing the separated liquid to enter into a gravity grease trap of the oil-water separation platform, conveying liquid into a slurry tank for homogenizing, performing secondary homogenization, acidifying the slurry, fermenting acidified material, processing the oil and biogas.    USE - The method is useful for harmless treatment of kitchen waste.    ADVANTAGE - The method is simple, economical, can extract oil in the waste, and enables the production of organic fertilizer from the biogas generated during the fermentation, saves energy and recycles the resources.    DETAILED DESCRIPTION - Comprehensive utilization method for harmless treatment of kitchen waste, comprises: (a) sorting the kitchen waste after collecting by manual or mechanical mode by an impurity crusher, (b) sorting the waste obtained in the step (a) on a solid-liquid separation platform through a vertically set screen, where the collected liquid part flows into an oil-water separation system platform, and the collected solid part is crushed by the crusher, (c) allowing the separated liquid to enter into a gravity grease trap of the oil-water separation platform, which carries out oil water separation of the liquid, and the separated oil is collected in an oil reservoir, and the remaining liquid is conveyed into a slurry tank for mashing, (d) performing mechanical crushing treatment to the solid part obtained after the solid-liquid separation of the kitchen waste, (e) homogenizing the slurry obtained after the step (c), and the separated liquid into the slurry tank by adjusting the steam pipe set at the bottom of the slurry tank, performing secondary homogenization under the action of steam, simultaneously from the top of the oil discharge pipe of the oil-water separator, the floating oil of the separated water is discharged into the oil reservoir, (f) acidifying the slurry obtained in the step (e) in an acidification tank, which process the organic macromolecules in the materials into small organic molecules to facilitate subsequent fermentation of the material, (g) performing thermophilic anaerobic fermentation of the acidified material at a high temperature for the conversion of the organic substances into biogas, and (h) processing the oil and extracting from the oil reservoir, processing the biogas by desulfurizing, dehydrating and purifying treatment, performing solid-liquid separation to the fermentation liquid, conveying a part to the slurry tank, and the remaining part of the biogas residue is conveyed into an organic fertilizer processing system.