▎ 摘　　要

NOVELTY - Light-transparent wave-absorbing and heat-conducting composite material comprises 60-89 pts. wt. nanocellulose, 8-35 pts. wt. boron nitride nanosheets, 10-37 pts. wt. graphene nanosheets, and 0.2-2 pts. wt. auxiliary agent. USE - The composite material is useful in the field of visualizing Fifth Generation (5G) electronic devices (claimed). ADVANTAGE - The material: has excellent interface compatibility; satisfies wave absorption and heat conduction; and has high optical transparency. The method: is simple; and has clear technical route and easy industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the composite material, comprising (i) adding boron nitride nanosheets, graphene nanosheets and auxiliary agents into a high-speed shearing machine, and stirring and dispersing to obtain a functional dispersion, (ii) dispersing nanocellulose into water to obtain nanocellulose solution, and (iii) adding the functional dispersion obtained in the step (i) to the nanocellulose solution obtained in the step (ii), stirring and mixing, then vacuum dehydrating, and drying to obtain finished product.