Abstract: Based on mechanical force effect, graphite nanosheets/bamboo charcoal(GN/BC) composites with excellent electrochemical performance were prepared by high-energy ball milling and pulverization, and high-temperature carbonization using bamboo charcoal and flake graphite as raw materials. Meanwhile, the high-temperature porous bamboo charcoal(PBC) prepared without flake graphite was used as the control sample under the same conditions. The surface morphology and structure of the material were characterized by X-ray diffraction(XRD), Raman spectroscopy(Raman), scanning electron microscope(SEM) and specific surface area and pore distribution analyzer. The electrochemical performance of the product was tested by a three-electrode system. The results showed that the addition of flake graphite with higher crystallinity could improve the crystallinity of the composites. High-energy ball milling could break the graphite flakes into nanostructures and embed them in the bamboo charcoal. The specific surface area of the prepared GN/BC was 863.47 m²/g, the total pore volume was 0.56 cm³/g, the micropore volume was 0.26 cm³/g, and the average pore diameter was 2.58 nm. At a current density of 1A/g, the composite material had a high specific capacitance of 280.97 F/g and good rate performance.