In this work, Ag/AgCl nanoparticles are immobilized onto the as-prepared CoFe₂O₄ fibers by a facile synthesis method. The amount of Ag/AgCl nanoparticles immobilized onto CoFe₂O₄ fibers can be tuned. The as-synthesized Ag/AgCl@CoFe₂O₄ composite fibers are characterized by XRD, FESEM and EM, and employed to degradate MO (Methyl Orange) dye in wastewater under visible light. The results show that AAC-4 fiber exhibits higher efficiency for the degradation of the MO dye under visible light illumination than other Ag/AgCl@CoFe₂O₄ composite fibers or pure Ag/AgCl sample, and the decolorizing efficiency of MO can research 98.2%. The immobilization of Ag/AgCl nanoparticles onto CoFe₂O₄ fiber promotes the enhancement of photocatalytic efficiency and stability.