Heat shrinkable sleeving is made of polymer, scientifically formulated and mechanically blended into a polymer alloy, which is cross-linked and continuously expanded by electron accelerator irradiation after the product is formed. The product has the advantages of environmental protection, softness, flame retardant, fast shrinkage and stable performance. It is widely used for wire connection, solder joint protection, protection and insulation treatment of wire ends, wire harnesses and electronic components, surface protection of fitness equipment parts and steel structures, anti-rust and anti-corrosion treatment of related products, marking of wires and other products, etc.