NOVELTY - A porous nanometer perovskite/graphene composite material comprises perovskite nanometer particles which are uniformly distributed on graphene film.    USE - As electro-catalysis material of the fuel cell or fuel battery such as zinc-air battery.    ADVANTAGE - The porous nanometer perovskite/graphene composite material has a average crystal grain size of 10-20 nm; has aperture of 0.5-1.5 microns; is prepared by simple technique; has low manufacturing cost; has good chemical uniformity and good electro-catalysis property; and greatly improves the capacity of the battery.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of porous nanometer perovskite/graphene composite material involving (1) preparing graphite paper as anode, rod as cathode, and 98% concentrated sulfuric acid as electrolyte, where the constant current is 0.2A below the graphite paper for peeling off oxide, where peeling off for 24 hours, using distilled water to make electrolyte that is diluted for 10 times, after cooling using 12000 r/minutes to room temperature after the high speed centrifuge separating and filtering, using distilled water to powder to be neutral after washing and filtering, vacuum drying at 50 degrees C, obtaining the graphene oxide powder, putting the powder into the distilled water according to a weight ratio of 1:1000, adjusting pH of 10 with ammonia water, when the power of 150 W under ultrasonic pool so as to obtain stable graphene oxide suspension, dropping water with callose in the suspension, heating for 10 hours with 80 degrees C constant temperature in water bath, until the reactant is neutral at vacuum dry (at 50 degrees C), to obtain the graphene material layer, (2) taking graphene material layer (10 mg), adding distilled water (100 ml) to dilute graphene suspension, adding water (0. 63 g) to the graphene suspension, ultrasonically dispersing for 60 minutes, adding citric acid (3.41 g), and alkylphenol polyoxyethylene ether, after the citric acid completely dissolving, dropping ammonia water into the solution and adjusting the pH value of 9, to obtain the lanthanum/graphene precursor solution, putting the precursor solution underwater bath at 50-70 degrees C after aging for 8-24 hours, drying in drying box at 80 degrees C, and at 450 degrees C in air, and cooling to room temperature along with the furnace.