The invention relates to a composite material of soy sauce residues and polylactic acid. The composite material of the soy sauce residues and polylactic acid is prepared from polylactic acid, the soy sauce residues, a thermoplastic elastomer and a modifier; the composite material can be used for being printed into tableware and a food container in a 3D manner, and has better toughness and mechanical properties and a unique flavor of the soy sauce residues; the composite material provides new thoughts and schemes for the treatment and solution of the waste soy sauce residues, and the application field of the composite material is enlarged more widely by a 3D printing technology, so that a 3D printing material is more abundant in types, furthermore, the environmental protection idea of waste reuse is also followed.