A novel thin-film composite (TFC) nanofiltration membrane was prepared through interfacial polymerization on surface hydrophilic-modified polypropylene (PP) membrane. Firstly, PP membranes were hydrophilized to ensure the formation of separation layer on it by interfacial polymerization. In this work, the UV-induced grafting of acrylic acid (AAc) was applied to modify the surface of PP membranes. Secondly, the TFC membranes were fabricated on PP membranes with different grafting degrees of AAc via interfacial polymerization. Effects of the UV-induced graft polymerization conditions, such as benzophenone concentration, monomer concentration and UV irradiation time, were systematically investigated. The surface-modified PP membranes and the TFC membranes were characterized with water contact angle measurement, attenuated total reflectance infrared and scanning electron microscopy. Furthermore, the permeation experiments were employed to evaluate the membranes' nanofiltration performance.