The disc-like α-Fe2O3/Ag/AgCl composite nanoparticles were synthesized via the multi-step method. Firstly, disc-like α-Fe2O3 NPs were prepared by the Al3+ assisted hydrothermal method. Then, Ag NPs were anchored on the surface of α-Fe2O3 NPs by the classical “silver mirror” reaction. Finally, the α-Fe2O3/Ag/AgCl composite nanoparticles were obtained by the in-situ oxidation. The structure, morphology and photocatalytic performance of as-prepared heterostructure were characterized by XRD、SEM、TEM and UV-vis absorption spectrum. The photocatalyst was used in the degradation of RhB, AO7 and MG under UV-visible light illumination. The better photocatalytic property of the photocatalyst was presented compared with the commercial TiO2 (P25). The enhanced photocatalytic performance could be ascribed to the broad spectral response of α-Fe2O3/Ag/AgCl and efficient charge transfer between plasmon-excited Ag nanoparticles and semiconductors. Significantly, this Fe2O3/Ag/AgCl composite nanoparticles could provide a viewpoint on preparing other plasmonic-based photocatalysts for the practical application in environmental issues.