The present disclosure provides a method of continuously converting kitchen waste using three environmental insects, including following steps: pre-solid-liquid separating and removing impurities of kitchen waste using feeding and drainage characteristics of Tenebrio molitor, Hermetia illucens, and Protaetia brevitarsis Lewis; feeding larvae of the Tenebrio molitor with solids added with crushed wheat bran in a day, and completely digesting the solids added with the crushed wheat bran in the day; and adding liquid with dung-sand of the Tenebrio molitor, crop straw dry powder, and probiotics to ferment, converting the fermented liquid added with the dung-sand of the Tenebrio molitor, the crop straw dry powder, and the probiotics by larvae of the Hermetia illucens, and then converting and digesting the fermented liquid added with the dung-sand of the Tenebrio molitor, the crop straw dry powder, and the probiotics by mixing larvae of the Protaetia brevitarsis Lewis.