The present invention provides a UV-crosslinked hot-melt pressure-sensitive adhesive used for a polyvinyl-chloride insulated adhesive tape, made by mixing a vinyl monomer, functional monomer, specialsoft monomer, and photoinitiator polymer with a tackifying resin and antioxidant in certain proportions; the composition of the photoinitiator polymer contains one or more copolymers of polymerizablephotosensitive initiator and acrylate monomer, or a mixture containing one or more polymerizable photosensitive initiator oligomers and acrylate high polymers. The polyvinyl-chloride adhesive tape made using such a pressure-sensitive adhesive has the advantages of excellent mechanical properties, bonding performance, and resistance to high temperatures, and is energy-saving and environmentally friendly; the invention overcomes the former defect of needing to use a longer thermal drying oven to coat a polyvinyl-chloride adhesive tape in order to volatilize the solvent in the glue, and is suitable for use in wrapping and strapping cable bundles at different positions in the body of an automobile; it is capable of satisfying the requirement of resistance to high temperatures at positions of the engine inside the vehicle, and can withstand temperatures of up to 125 DEG C.