NOVELTY - Preparing nano palladium-graphene three dimension porous composite electro-catalyst comprises (a) cleaning foam nickel using glacial acetic acid, acetone and ethyl alcohol, again cleaning with deionized water, and drying; (b) preparing graphene oxide aqueous solution, directly soaking the foam nickel, reacting, depositing the graphene on the surface of the nickel foam to obtain three-dimensional porous structure nickel foam-graphene product; and (c) directly soaking the nickel foam-graphene product in potassium chloropalladate aqueous solution, and carrying out electron reduction reaction.    USE - The composite electro-catalyst is useful as ethanol fuel cell anode (claimed).    ADVANTAGE - The composite electro-catalyst has excellent foam product performance and high stability.    DETAILED DESCRIPTION - Preparing nano palladium-graphene three dimension porous composite electro-catalyst comprises (a) taking foam nickel, using glacial acetic acid, acetone and ethyl alcohol for cleaning, again cleaning with deionized water, and drying; (b) preparing 0.5-10 mg/ml graphene oxide aqueous solution, directly soaking the foam nickel in the aqueous solution, allowing to stand the reaction, controlling the reaction temperature to 30-80 degrees C, where the soaking time is 1-12 hours, where using foam nickel as substrate for directly reducing graphene oxide, depositing the graphene on the surface of the nickel foam to obtain three-dimensional porous structure nickel foam-graphene product; and (c) directly soaking the nickel foam-graphene product in 0.05 mmol/l potassium chloropalladate aqueous solution for 5-30 minutes, controlling the reaction temperature to 0-10 degrees C, carrying out electron reduction reaction on the graphene surface with chloropalladic acid radical ions, and directly forming graphene surface nano palladium particles having average particle diameter, and taking out after reaction to obtain graphene composite electro-catalyst product with three-dimensional porous structure loaded with palladium nanoparticles.