The invention discloses a high-performance wood-plastic composite material and a preparation method thereof. The material is prepared from the following components in parts by weight: 60 to 80 parts of peanut hull powder, 30 to 50 parts of bamboo powder, 60 to 90 parts of abandoned plastics, 15 to 25 parts of epoxy resin, 4 to 6 parts of mineral fibers, 5 to 7 parts of magnesium carbonate whiskers, 4 to 6 parts of nano calcium carbonate, 6 to 9 parts of maleic anhydride, 3 to 5 parts of an organosilicone water-proofing agent, 2 to 4 parts of an 168 antioxidant, 3 to 5 parts of a red phosphorus fire-retardant and 3 to 5 parts of a 788 light stabilizer. The preparation method comprises the processing steps of modified pre-treatment, mixing at high speed, hot press molding, cooling setting and the like. The wood-plastic composite material obtained through the method has the advantages of high compressive strength, high abrasive resistance, low cost, high distortion temperature and the like, and the material and the method, provided by the invention, also have the advantages of simple processing technique, short processing time, low cost and the like, and are suitable for industrial production.