▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene wave absorbing material comprises (i) preparing graphene oxide aqueous solution, (ii) preparing polymer microsphere/carbon precursor, (ii) adding reducing agent into the graphene oxide aqueous solution to obtain mixed solution, and then adding precursor into the mixed solution, mixing to obtain a reaction solution, and then preparing three-dimensional graphene hydrogel coated with a precursor from the reaction solution, (iv) immersing three-dimensional graphene hydrogel in organic solvent, removing polymer microspheres in the three-dimensional graphene hydrogel to obtain porous three-dimensional graphene hydrogel, (v) washing and drying porous three-dimensional graphene hydrogel, and (vi) placing three-dimensional graphene material in inert atmosphere to obtain final product. USE - The three-dimensional graphene wave absorbing material is useful in electromagnetic wave absorption and stealth, and for absorption of electromagnetic waves in the x and k( alpha ) bands (all claimed). ADVANTAGE - The three-dimensional graphene wave absorbing material: has freely and controllable pore size and volume, aperture size and volume, and ensures free design of absorption of different electromagnetic waves.