▎ 摘　　要

NOVELTY - Preparing high-impact polyvinyl chloride comprises taking supercritical fluid as reaction medium, supercritical auxiliary agent as auxiliary agents, adding high impact modifier, polymerizing in the presence of initiators and polymerization auxiliary agents, adding termination agent after completing reaction and releasing the pressure to obtain high-impact polyvinyl chloride, where the high-impact polyvinyl chloride comprises chlorinated polyethylene, methyl methacrylate-butadiene-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, ethylene-vinyl acetate copolymer, acrylic acid-acrylate copolymer, acrylonitrile and butadiene random copolymer and/or nano calcium carbonate. The dosage of the high impact modifier is 0.001-100% of the mass of polyvinyl chloride. USE - The method is useful for preparing high-impact polyvinyl chloride. ADVANTAGE - The polyvinyl chloride resin has good impact resistance, improves heat stability, good processing fluidity and has excellent performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a high-impact polyvinyl chloride, which is prepared by the above method.