▎ 摘　　要

NOVELTY - Method for preparing carbon-based wave-absorbing coating involves oxidizing and reducing the carbon nano tube in sequence to obtain a reduced-oxidized carbon nano tube; adding graphene oxide into the carbon black dispersion liquid, uniformly mixing, adding a reducing agent, and reacting to obtain a carbon black/reduced graphene oxide composite absorbent; adding the reduced carbon oxide nanotube and the carbon black/reduced graphene oxide composite absorbent into aqueous polymer resin. USE - Method for preparing carbon-based wave-absorbing coating. ADVANTAGE - The height of the light three-layer honeycomb sandwich structure composite wave-absorbing material is less than 20 mm (in the embodiment, 15 mm), the light three-layer honeycomb sandwich structure composite wave-absorbing material has obvious height advantage compared with the honeycomb structure wave-absorbing material in the prior art, and full-band absorption can be basically realized within the radar frequency range of 2-18 GHz (less than-10 dB). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: Carbon-based wave-absorbing coating; and Honeycomb sandwich structure composite wave-absorbing material, which comprises a carbon fiber plate, a prepreg, an adhesive film, a honeycomb core and a quartz plate which are sequentially arranged, where the honeycomb core is impregnated with the carbon-based wave-absorbing coating.