Waterborne polyurethane acrylate emulsion(PUA)was prepared by free radical polymerization with polyester polyol, dimethylol propionic acid, diphenylmethane diisocyanate and pentaerythritol triacrylate(PETA)as raw materials and adding initiator. The properties of emulsion were characterized,and the effect of PETA on the performance of emulsion and its application on laminated composite packaging material were emphatically studied. The research results showed that when w(PETA)=2%(relative to the total mass of PUA emulsion),the stability of PUA emulsion was good,the tensile strength of PUA film reached 13 MPa,the water absorption rate of the film was 7.4%,and the peel strength of aluminum foil base was 14.3 N/(25 mm). The data indicated that the PUA emulsion met the application requirements in laminated composite.