In this paper, polyurethane UV adhesion-reducing adhesives was prepared by hydroxyl terminated polybutadiene reacted with isophorone diisocyanate firstly, and then 1,4-butanediol or 1,4-butenediol was used as chain extender to expand the chain and control the content of C=C in the main chain, and two or three functional acrylate was used as crosslinking monomer monomers. The molecular structure of the adhesion-reducing adhesives was characterized by Fourier transform infrared spectroscopy (FT-IR). The effect of cross-linking degree on adhesion-reducing was investigated. The experimental results show that with the increase of the cross-linking density and the gel ratio of the adhesion-reducing adhesives, the volume shrinkage of adhesive increases, and then the surface roughness increases, and the adhesion-reducing effect is obvious. When 1,4-butenediol is used as chain extender and trimethylolpropane triacrylate (TMPTA) is used as crosslinkable monomer, the peeling strength reaches 19N/25mm before UV irradiation, and decreases to 0.2N/25mm after UV irradiation, which meets the application requirements.