The invention provides a method for preparing a flower-shaped copper nano-cluster-graphene-foamed-nickel material. The method mainly comprises the process steps of 1, growing a layer of graphene on the foamed nickel substrate through a chemical vapor deposition method (CVD) to prepare a graphene-foamed-nickel substrate; 2, directly immersing the graphene-foamed-nickel substrate in a mixed solutionof copper sulfate and L-arginine, enabling the reaction to take place for 3-6 hours to obtain the flower-shaped copper nano-cluster-graphene-foamed-nickel composite material. The prepared flower-shaped copper nano-cluster has a special flower-shaped structure, so that the specific surface area of copper particles is greatly increased, so that the material has a wide application prospect in some special fields such as gas sensing.