A series of high content UV-curable waterborne polyurethane /polyacrylate emulsion (UV-WPUA) were synthesized by Polyethylene glycol 600 diacrylate (PEG600DA) as polymerizable nonionic emulsifier. The structure and properties of UV-WPUA emulsion and films were characterized by Fourier transform infrared spectroscopy (FTIR), Dynamic laser light scattering instrument (Size), thermogravimetric analysis (TGA), Differential scanning calorimeter (DSC) and Mechanics Performance Testing. The results showed that: When PEG600DA mass fraction increased from 0% to 10.87%, the emulsion partical size decreeased from 48.16 nm and 27.09 nm, after increased to 78.52 nm, the glass transition temperature of soft section (Tgs) rised, and the glass transition temperature of hard segment (Tgh) decreased, the tensile strength firstly increased from 22.19 to 27.82MPa，and then descended to 17.13, the elongation at break reduced from 315.17% to 203.93. when PEG600DA content was 6.09%, the thermal stability of the film was optimal，the thermal decomposition temperatures with 10%, 30% and 50% weight loss were improved by 16.324, 18.804 and 17.547 ℃ respectively.