The invention discloses an all-resource comprehensive utilization method of kitchen waste. The method comprises the steps as follows: (1) separating kitchen waste through solid-liquid separation to obtain kitchen waste oil water and a solid part; (2) centrifuging the kitchen waste oil water, and collecting waste water and waste oil respectively; (3) crushing the solid part collected in step (1), remixing the crushed solid part with the waste water collected in step (2), adding sawdust, and then, inoculating the mixture with microorganisms for temperature-control fermentation; (4) drying and crushing a fermented product prepared in step (3) to obtain bio-organic fertilizer rich in viable bacteria. The biotechnology is used as the core and grafted with a traditional tretament process, organic fertilizer and kitchen waste oil are produced from the kitchen waste innovatively, the production process of products cannot harm the environment, all-resource recycling of the kitchen waste is realized, and double harvest of economic benefits and social benefits can be realized.