And the present invention was published with respect to plastic and metal composite material and its manufacturing method, the method of metal powder injection molding method comprising injection molding of a metal structure product of uniform shape a mixed material of the metal powder and the adhesive on the injection machine (S1), and metal structure product degreasing sintering step (S2) by sintering the degreased metal structure for obtaining a product 0.5-2μm micron grade micropore structure in the metal surface by removing the product of the pressure-sensitive adhesive that, on the basis of the chemical class micron micropores of 20-40nm to corrode to form a tense ball of 20-40nm nano-micron grade fine micropores nanohwa step (S3), and chemical injection molding when I had to leave the metal structure which is filled into plastic molds of plastic and integrated which comprises a mold the injection molding stage (S4). The composite material is the product made by the method described above. Compared to the conventional art, the present invention was to reduce production costs have improved the production efficiency also has the remarkable inventive step by solving the difficult problem of metal structure product molding.