▎ 摘　　要

NOVELTY - A functional graphene composite molten salt comprises functionalized graphene and molten salt with mass ratio of 0.1:100-20:100. USE - Functional graphene composite molten salt (claimed). ADVANTAGE - The functional graphene composite molten salt has high thermal conductivity and high heat storage density, and is prepared at low cost by simple process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of functional graphene composite molten salt, which involves adding graphene oxide to deionized water, ultrasonically dispersing, adding aqueous hydroxide solution, reacting, separating to obtain functionalized graphene, mixing molten salt and functionalized graphene in mass ratio, heating, and cooling.