Preparation method of multi-dimensional high-thermal-conductivity graphene composite board

The invention belongs to the technical field of heat conduction materials, and particularly relates to a preparation method of a multi-dimensional high-heat-conduction graphene composite board, whichcomprises the following steps: uniformly mixing and dispersing graphene, resin, a dispersing agent and a solvent, pouring into a mold, and pre-drying to obtain a pre-dried graphene composite material;then vertically inserting carbon fibers into the graphene composite board made of the graphene composite material in an electrostatic flocking mode, and obtaining the multi-dimensional high-thermal-conductivity graphene composite board through a series of processes of drying, carbonizing, dipping, carbonizing, graphitizing and the like. According to the method disclosed by the invention, an effective compounding method is found for graphite and carbon fibers, so that the compounded material has multi-dimensional good thermal conductivity, the in-plane thermal conductivity is 700W/m/K or above, and the vertical in-plan