Visible-light-driving syntheses have emerged as a powerful tool for the preparation of macromolecules under mild and environmentally benign conditions.Nevertheless,a photocatalyst is necessary to activate the polymerization,which is expensive and cannot be reused,limiting its practicality and environmental benefits.Here,we find that a polymer nanofiber has remarkable activity in catalyzing the living free radical polymerization driven by visible-light without the assistance of sacrificial reagents or precious metal co-catalysts.These polymer nanofibers are very stable even after repeated cycling,and can be reused without appreciable loss of activity.The finding may present a promising strategy towards the development of efficient photocatalyst for polymerization driven by visible-light with great environmental benefits can directly harvest energy from solar light.