Abstract: The present disclosure relates to a harmless and recycling treatment method for kitchen waste. The method includes: step S1: sorting the kitchen waste, deodorizing the kitchen waste, and then implementing a solid-liquid separation to the kitchen waste to obtain solid and filtrate; step S2: adjusting pH of the filtrate to 12-13, adding a demulsifier to the filtrate, standing still, recovering an upper layer of oil and obtaining a lower layer of clear liquid; drying and burning the solid obtained in the step S1, to obtain biochar; and step S3: implementing an advanced oxidation treatment and a biochemical treatment to the lower layer of clear liquid obtained in the step S2, to obtain water. The method can effectively recycle the kitchen waste into resources, alleviate the social and environmental problems caused by the current kitchen waste, and the method is suitable for popularization and application.