A series of 2,4-Dihydroxybenzophenone modified anionic waterborne polyurethane (UVWPU) emulsions were prepared by anionic self emulsifying with isophorone diamine (IPDI), poly-caprolactone diol (PCL), 2,2-dimethylolpropionic acid (DMPA), trimethylol propane (TMP), 1,4-butanediol(BDO) and 2,4-Dihydroxybenzophenone(UV-0) as main raw materials. Structure and properties of polymer were characterized by FT-IR, UV-Vis, XRD, tensile testing and TGA. The effects of the content of UV-0 on the properties of UVWPU emulsion and its films were also studied. When w%(UV-0)=2.0%, the average particle size was 109.6 with narrow particle size distribution. Compared with the pure waterborne polyurethane (WPU), the thermal stability of UVWPU latex film the maximum decomposition temperature has improved from 301.14℃ to 318.27℃, the ultraviolet absorption rate increased to 0.58， and the tensile strength was up to 48.1 MPa.