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In this study, a novel visible-light-driven N-doped carbon dot (NCDs)/g-C₃N₄ composite was successfully synthesized by loading NCDs nanoparticles onto the interlayers and surface of g-C₃N₄ via a facile polymerized method. The photocatalytic activity of the NCDs/g-C₃N₄ was remarkably higher than that of g-C₃N₄ and CDs/g-C₃N₄ toward the degradation of indomethacin (IDM) under visible light irradiation. With increasing NCDs loading volumes, the photocatalytic activity of NCDs/g-C₃N₄ initially increased, and then decreased. A very low NCDs content of 1.0 wt% resulted in a 13.6 fold higher reaction rate than that of pristine g-C₃N₄. This enhanced photocatalytic activity might have been ascribed to the unique up-converted PL properties, efficient charge separation, as well as bandgap narrowing of the NCDs. Reactive species (RS) scavenging experiments revealed that superoxide radical anions (O₂radical …