The invention relates to a method for manufacturing an impressing mold insert which comprises the following steps: providing a mold insert rough blank which has a molding surface and a rim part around the molding surface; forming a coating film layer on the molding surface and the rim part, and performing pulverization treatment to the coating film layer; ultraprecisely processing the molding surface to form the mold insert; obtaining a main mold insert by impressing the mold insert on a plastic substrate, the main mold insert having array arranged patterns; and obtaining the impressing mold insert by impressing the main mold insert.