The present invention relates to a novel polyurethane-based UV-curable composition, comprising a low-crystallinity polyurethane polymer, a multifunctional thiol compound, a multifunctional epoxy resin compound, a photobase generator, and an optional photosensitizer. Adhesive films, adhesive tapes, and bonded members with excellent initial bonding performance, die cutting performance, overlap strength and drop-resistance performance may be obtained by using the polyurethane-based UV-curable composition provided by the present invention.