Abstract: WO₃ nanorods were synthesized by hydrothermal method and WO₃-Ag/graphitic C₃N₄ (g-C₃N₄) composite photocatalysts were synthesized by simple solvent evaporation and light deposition. The materials were characterized by XRD, SEM and TEM, et al. The results show that the WO₃-Ag/g-C₃N₄ composite photocatalysts can expand the visible light response and effectively inhibit the photogenic electron and hole recombination due to the successful construction of Z-scheme heterojunction. Under the optimal conditions, the catalytic degradation efficiency of Rhodamine B (RhB) in 100 min is up to 96.8%, and the WO₃-Ag/g-C₃N₄ composite photocatalysts have excellent stability. The photocatalytic mechanism indicates that the real active substances in photocatalytic experiments are hydroxyl radical and superoxide radical.