NOVELTY - A fuel cell catalyst layer based on poriferous proton exchanging membrane comprises poriferous proton exchanging membrane, catalyst, or proton exchanging resin, where the catalyst and proton exchanging membrane are in micropore of poriferous proton exchanging membrane. The poriferous proton exchanging membrane comprises proton exchanging resin monomer of sulfonic acid radical group, where proton exchanging resin is fluorin sulfonic acid resin. The catalyst is noble metal elementary substance or metal alloy catalyst. The carrier of catalyst is nanometer carbon black or nanometer carbon fiber.    USE - The fuel cell catalyst layer based on poriferous proton exchanging membrane is useful for industrial applications.    DETAILED DESCRIPTION - A fuel cell catalyst layer based on poriferous proton exchanging membrane comprises poriferous proton exchanging membrane, catalyst, or proton exchanging resin, where the catalyst and the proton exchanging membrane are in the micropore of the poriferous proton exchanging membrane. The poriferous proton exchanging membrane comprises proton exchanging resin monomer of sulfonic acid radical group, where the proton exchanging resin is fluorin sulfonic acid resin or sulfonation thermal stability polymer with proton exchanging function that is sulfonation polyether sulfone resin, sulfonation polyphenylene sulphide resin, sulfonation polybenzimidazole resin, sulfonation polyphosphazenes resin, sulfonation polyimide resin, sulfonation polystyrene resin, sulfonation separated polystyrene resin, sulfonation tri fluorobenzene ethylene resin, polyphenylene methyl sulfonic siloxane resin, sulfonation polystyrene- polyethylene multipolymer resin, sulfonation polystyrene polyethylene or butylenes- polystyrene resin, fat sulfonation poly oxygen benzene resin or sulfonation polyether-ether-ketone resin. The catalyst is loading type noble metal elementary substance or noble metal alloy catalyst with high catalyze activity, or loading type noble metal elementary substance or noble metal alloy catalyst that has pre-oxidation treatment. The noble metal alloy is MxNy or MxNyOz, where x, y and z are metal weight proportions in catalyst. The noble metal elementary substance is platinum (Pt), ruthenium (Ru), palladium (Pd), rhodium (Rh), iridium (Ir), or osmium (Os). The carrier of the catalyst is nanometer electric carbon black, mesoporiferous carbon, conductive ceramics, carbon nanometer tube, or nanometer carbon fiber.    M, N, or O=Pt, Ru, Pd, Ir, Os, Fe, Cr, Ni, Co, Mn, Cu, Ti, Sn, V, Ga, or Mo;    x, y, z=0-100;    x+y=100; and    x+y+z=100.    An INDEPENDENT CLAIM is a preparation method of the fuel cell membrane electrode layer based on poriferous proton exchanging membrane.