The invention discloses a high-quality PVC (polyvinyl chloride) heat-shrinkable sleeve. The high-quality PVC heat-shrinkable sleeve comprises, by weight, 56-66 parts of PVC resin, 25-35 parts of acrylonitrile-butadiene-styrene copolymers, 2-5 parts of diatomaceous earth composite urea, 3-7 parts of diphenylethanedione oxide, 3-6 parts of graphite-modified polyurethane elastomers, 3-6 parts of nanometer aluminum oxide, 2-4 parts of nanometer carbon fibers, 2-4 parts of polyester fibers, 2-5 parts of toughening agents, 2-6 parts of stabilizers, 3-8 parts of poly-silicon borane, 0.2-0.8 part of lithium oxide, 2-3 parts of compatilizer, 2-4 parts of flame retardants, 2-4 parts of antioxidants and 2-5 parts of dispersing agents. The high-quality PVC heat-shrinkable sleeve has the advantages that the PVC resin is used as a main material and is matched with the acrylonitrile-butadiene-styrene copolymers and diversified additives, and accordingly the high-quality PVC heat-shrinkable sleeve isexcellent in heat resistance, heat-shrinkable performance, impact resistance, corrosion resistance and aging resistance.