The invention provides a method for preparing rapeseed peptide through lysozyme synergistic solid state fermentation, which aims at solving the problem of low yield of the rapeseed peptide through single mixed bacteria solid state fermentation in the prior art. The method uses the bacteria and mould capable of producing protease as well as protease to prepare the rapeseed peptide through synergistic solid state fermentation of rapeseed dregs, and comprises the following steps of smashing the rapeseed dregs, preparing a leavening agent, solid state fermenting, deactivating the enzyme, separating and removing residues, decoloring, debitterizing, desalting, separating and purifying, and drying so as to obtain rapeseed peptide powder. According to the method, on one hand, solid state fermentation of microorganism generates multiple metabolic products and enzymes, so as to hydrolyze protein and effectively degrade toxic substances in the rapeseed dregs, compared with the enzymolysis method, the method improves the efficiency and greatly lowers bitter; on the other hand, the added neutral protease plays a helping role in peptide fragment, compared with fermentation through single microorganism, the method greatly improves the degradation degree of the protein, and improves the yield of the rapeseed peptide.