The invention relates to the technical field of buckles, in particular to a bamboo-plastic buckle and a preparation method thereof. The bamboo-plastic buckle is prepared by carrying out injection molding on bamboo-plastic masterbatch; the bamboo-plastic masterbatch is prepared from polyamide 66 (PA 66), bamboo fibers, carbon fibers, carbon nanotubes, bisphenol A-bis(diphenyl phosphate), a synergistic flame retardant, an acid anhydride modified vinyl copolymer, a lubricant, an antioxidant 612S and an antioxidant 1076. The material obtained by reasonably compounding all the raw materials is excellent in mechanical properties; the tensile strength, bending strength, bending modulus and notch impact strength of the material respectively reach up to 92Mpa, 101Mpa, 2870Mpa and 9KJ/m<2>; the flame-retardant level can reach V0; furthermore, the material is high in degradability, and meets the various needs of the buckle.