Generally, the garbage produced in the kitchen is nothing more than vegetable leaves, fruit kernels or fish bones, which are rich in complex organic compounds such as protein, fat and sugar. The design uses this feature to obtain a solid-liquid mixture through five-stage grinding and crushing treatment of kitchen waste, and then drying and filtering to separate the filtrate from the solid residue, and finally transfer the obtained solid fertilizer to the collection bin so as to obtain organic fertilizer on the basis of cleaning kitchen waste.