Novel eco-friendly sulfonated polyurethane/polyacrylate (SPUA) emulsions were synthesized by in situ soap-free emulsion polymerization method using isophorone diisocyanate (IPDI) and sodium sulfonate modified polyester polyol (SDNP) as raw materials and pentaerythritol triacrylate (PETA) with hydroxy and vinyl groups as fictional monomer. The effect of different w(PETA) on properties and morphology of the SPUEA emulsions and films were characterized by dynamic light scattering (DLS),thermo gravimetric analysis (TGA), mechanical properties and atomic force microscope (AFM). The results show that with the w(PETA) increased from 0.5% to 2%, the particle distribution become wider and the particle size increased from 87nm to 112nm, the tensile strength increased from 8.2MPa to 11MPa. With the w(PETA) increased from 1% to 2%, the half decomposition temperature increased from 314.57℃ to 330.57℃. The AFM results demonstrated that the compatibility between the two phased was also enhanced. When the w(PETA) was 2%, the gel content was 84.57%, and water absorption was 8%, the comprehensive performance of the SPUEA film was better. The SPUEA could be used as adhesives. The T-peel strength increased from 6.98N/mm to 11.23N/mm when the PETA mass fraction was up to 2%, and the emulsions could wet the PVC surface well.