The present invention discloses a porous metal material. The material is multilevel porous metal material, which is classified based on the pore size of the material. The number of classified levels is at least more than two. The pore size of the smallest level of porous metal material is less than 1 micrometer. The elasticity modulus of the smallest level of porous metal material is less than 80GPa. The porosity is no less than 48%. The preparation method thereof is as follows. The raw material powder used to prepare porous metal material and the pore-forming agent used to prepare the smallest level of pores cavities are mixed to prepare the slurry. The slurry is uniformly filled into polymer material support to form a green body. The green body is dried and crushed to obtain mixed grains. Mixed grains are uniformly mixed with the pore-forming agent used to prepare the pore cavity which is larger than the smallest level of pore cavities, so as to prepare the compact green body. The compact green body is sintered in vacuum and is subjected to conventional follow-up processing based on the raw material processing. Such material with multilevel elasticity modulus can meet different usage requirements. The connectivity is good. Such material is particularly suitable to be used as tissue regeneration material. The preparation method is simple and easy to achieve.
