The invention provides a high-strength and wear-resistant dental repair material which is composed of the components in parts by weight: 20-40 parts of polyethylene, 17-35 parts of xanthan gum, 18-32parts of nano-hydroxy calcium phosphate, 2-6 parts of chitosan, 3-8 parts of tributyl citrate, 4-9 parts of dodecyl trimethylammonium chloride, 3-9 parts of triethylenetetramine, 20-38 parts of 2-methyl-2-acrylic acid-2-(phosphonyl oxy)ethyl ester, 15-35 parts of ethyl acetate, 7-9 parts of polyethylene modified carbon nanotubes, 5-15 parts of titanium dioxide, 8-16 parts of zinc oxide, 6-10 partsof dibutylhydroxytoluene, 5-8 parts of 4-methoxyphenol, 4-8 parts of calcium phosphate, 5-15 parts of diamond micro-powder, 10-20 parts of ethanol, and 25-45 parts of deionized water. By addition ofthe surface modified carbon nanotubes and the diamond micro-powder, the high-strength and wear-resistant dental repair material is prepared, the hardness and wear resistance of the material are increased while high strength and toughness are ensured, and the service time of the repair material is prolonged. As the dental repair material, the composite material has broad application prospects.