The invention discloses high-hardness impact-resisting heat-insulation foaling plastic. The high-hardness impact-resisting heat-insulation foaling plastic is prepared from, by weight, 20-25 parts of polystyrene resin, 40-55 parts of polyurethane resin, 20-25 parts of phenolic resin, 10-15 parts of urea formaldehyde resin, 4-7 parts of diethylaminopropylamine DEAPA, 2-5 parts of azobisformamide AC, 0.9-1.2 parts of polydimethylsiloxane-polyoxyalkylene copolymer, 1-4 parts of talcum powder, 0.3-0.6 part of quartz powder, 1.4-1.7 parts of hollow microspheres, 1-4 parts of bentonite, 20-25 parts of diatomite, 10-13 parts of calcium carbonate, 5-8 parts of polyethylene-octene copolymer elastomer and 12-16 parts of glass fiber, wherein the polydimethylsiloxane-polyoxyalkylene copolymer is obtained by polydimethylsiloxane and polyoxyalkylene through blending modification, and the polyethylene-octene copolymer elastomer is obtained by polyethylene and octene through blending modification. Air bubbles in the high-hardness impact-resisting heat-insulation foaling plastic are even, the heat conductivity coefficient is reduced, the heat-insulation performance is improved, and the hardness and impact resistance are further greatly improved.