▎ 摘　　要

NOVELTY - Three-dimensional metal nanoparticle/graphene porous composite material is prepared by adding potassium hydroxide into aqueous graphene oxide solution-A, drying and reacting at 700-1000 degrees C, washing and drying to obtain porous graphene, grinding porous graphene into a powder, dispersing uniformly in an organic solvent containing a metal salt, stirring by adding deionized water-B, and hydrothermally reacting at 100-140 degrees C, suction filtering, washing and drying, adding deionized water-C, stirring, adding graphene oxide aqueous solution-D, and performing hydrothermal reaction-III at 160-200 degrees C, naturally shrinking and drying at room temperature, and heating at 150-300 degrees C, is claimed. USE - The material is useful in the field of lithium ion batteries and sodium ion batteries (claimed). ADVANTAGE - The material has high density and self-supporting structure.