The invention discloses high-performance conductive paper and a preparation method thereof. The method comprises the following steps: (1) uniformly mixing hemp pulp of which the degree of beating is 30 to 80oSR with a carbon fiber, and then performing papermaking, so as to obtain molded paper; (2) adding copper powder into a sizing agent, and performing stirring, so as to obtain a copper-containing sizing material; (3) coating the surface of the molded paper obtained in the step (1) with the copper-containing sizing material obtained in the step (2), and then performing hot pressing and drying, so as to obtain conductive paper; (4) coating the surface of the conductive paper obtained in the step (3) with the surface sizing agent, and then performing hot pressing and drying for the second time, so as to obtain the high-performance conductive paper. The hemp pulp, guar gum, EVA, the carbon fiber and the like in the high-performance conductive paper are environmental-friendly materials, so that the environmental pollution can be effectively reduced, and the production cost is reduced. According to the high-performance conductive paper and the preparation method thereof, the problems of disengagement of metal powder and oxidation in a long-time using process are solved, the produced paper has high strength and high conductivity, the using range of the paper can be expanded, and the service life of the paper can be prolonged.