▎ 摘　　要

NOVELTY - A three-dimensional porous graphene aerogel wave-absorbing material is prepared by respectively taking graphene oxide aqueous solution, reducing agent and anti-freeze agent, stirring by magnetic force, ultrasonically dispersing to obtain mixed solution, transferring mixed solution into glass bottle, sealing and placing in oven to pre-reduce to obtain pre-reduced graphene hydrogel, freezing at - 30 to - 70 degrees C for 10-60 minutes, thawing at room temperature for 30-60 minutes to obtain freeze thawed pre-reduced graphene hydrogel, sealing and placing in oven for continuously reducing to obtain graphene hydrogel, putting into ethanol/water mixed solution for aging for 24-72 hours and freeze-drying. USE - The method is used for preparing three-dimensional porous graphene aerogel wave-absorbing material. ADVANTAGE - The material has pore size and volume that can be freely and controllable, and realizes free design of different electromagnetic wave absorption by controlling pore size and volume.