The invention relates to a high temperature graphitization method for a nano carbon material, which comprises the following steps: filling the nano carbon material into a graphite tank, compacting the nano carbon material and tightly covering the graphite tan; respectively processing two holes at both upper and lower ends of the graphite tank, connecting the lower end of the graphite tank to a vacuum pump and connecting the upper end of the graphite tank to a high-pressure argon gas bottle; injecting argon gas with the pressure of 0.2 to 0.4MPa into the graphite tank, pumping out the air in the nano carbon material under the action of the vacuum pump, full filling the nano carbon material with the argon gas, then improving the pressure of the argon gas to 1 to 2 MPa, pulling out an exhaust tube of the vacuum pump, keeping the pressure of the argon gas of 1 to 2 MPa for 30 to 60min, cutting off the agron gas and blocking gas holes at both the ends; placing the packaged graphite tank into an acheson furnace, full filling coke around the graphite tank, thermally shielding the periphery of the coke by a mixture of coke powder, carbon black and silica sand/coke/silicon carbide and powering on the coke in the length direction of a furnace body to heat to a temperature of 2,800 to 3,000 DEG C; cooling to the room temperature to take out the obtained product. The invention provides a method for carrying out graphitization on the nano carbon material in a non-vacuum state, which is particularly suitable for high temperature graphitization of the nano carbon material with a low loose specific weight and can reduce loss of the nano carbon material and reduce graphitization cost.