Abstract: A type of macromolecular light stabilizers with UVabsorbing and shielding performance was prepared by using waste acrylic fabrics as a raw material, and then the weatherable for polypropylene (PP)based composites were prepared by mixing this light stabilizer with PP and conventional hindered phenolic light stabilizers. The effect of this macromolecular light stabilizer on the aging performance of PP was investigated. Compared with the conventional hindered phenolic light stabilizers, the macromolecular light stabilizer exhibited much better UVabsorbing and shielding effects on PP. The carbonyl index of PP reached 150.3 after artificially accelerated aging for 500 h under the UV light, and however, the PP/HWPAN-g-TiO2 composites only achieved a carbonyl index of 53. Moreover, PP/macromolecular light stabilizer composites exhibited a decrease in tensile strength by 72.4 %. On the other hand, PP/HWPAN-g-TiO2 composites only showed a decrease in tensile strength by 13.8 %.