▎ 摘　　要

NOVELTY - Graphene material comprises a cavity is provided between two graphene layers. A spherical graphene located in the cavity between two graphene layers. The spherical graphene has a hollow structure. USE - Material graphene. ADVANTAGE - The graphene material has excellent dielectric loss performance, and can quickly convert the electromagnetic wave into heat energy consumption and dissipate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the preparation method of the graphene material. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of a preparation method of the graphene material. (Drawing includes non-English language text).