Metal film microporous material is a kind of metal powder porous material made by special rolling process. This porous material has the characteristics of small aperture, high porosity and thin thickness, so it has the characteristics of high filtration accuracy, relatively good permeability and easy reverse washing regeneration. If the metal microporous membrane material with asymmetric structure is prepared by composite process, the pore diameter can reach 0.1um or even smaller. Therefore, it shows great potential in the aspects of ultrapure separation, reaction catalysis and biological environmental protection. It has been successfully applied in the fields of electronics, nuclear energy, chemical industry, medicine, food, precision machinery, etc., in the fields of ultrapure gas purification, gas phase separation, aseptic filtration, concentration and micro (ultrafiltration).