The invention relates to a preparation method of fullerene, which comprises the following steps: carrying out discharge synthesis in a synthesis furnace, generating soot containing the fullerene, collecting into a collector for stirring and dissolution, sending into a reaction kettle for heating and stirring, then carrying out centrifugation in a centrifuge, simultaneously sending to a vacuum distillation reactor for distillation and concentration, and recycling solution after distillation; adding remaining solids after drying by distillation into the solution for dissolution, then filtering,introducing filtrate obtained by filtration into another vacuum distillation reactor for distillation and concentration; and carrying out chromatographic separation on a fullerene sample obtained by distillation and concentration and then obtaining a pure product. The method can continuously complete the technical processes of synthesis, reaction, filtration, ultrasound, distillation, liquid inlet, discharge and the like, and prepare the fullerene under the continuous and closed conditions without dust pollution and chemical pollution.