A　novel　deposition-precipitation　method　was　successfully　developed　to　loading　Au　nanoparticles　on　the　surface　of　Cd2Nb2O7　photocatalyst　with　a　wide　band-gap.　The　as-prepared　photocatalyst　exhibited　visible　light　response　properties　due　to　the　Surface　Plasmon　Resonance　(SPR)　of　Au　nanoparticles.　The　crystalline　structure,　morphology,　photoabsorption　performance,　surface　chemical　state　and　active　species　of　the　as-synthesized　sample　were　characterized　by　X-ray　powder　diffraction　(XRD),　UV-Vis　diffuse　reflectance　spectra　(UV-Vis　DRS),　transmission　electron　microscopy　(TEM),　X-ray　photoelectron　spectra　(XPS)　and　photoluminescence　(PL).　Results　showed　that　the　Au　existed　in　the　form　of　metallic　state　and　Au　nanoparticles　with　an　average　diameter　of　ca　5　nm　were　uniformly　loaded　on　Cd2Nb2O7.　The　SPR　peak　of　Au-Cd2Nb2O7　was　clearly　observed　at　ca　540　nm　in　the　visible　light　region.　In　addition,　the　photocatalyst　exhibited　an　efficient　photocatalytic　activity　for　degrading　rhodamin　B　(RhB)　under　visible　light　irradiation.　Furthermore,　the　possible　photocatalytic　mechanism　has　also　been　proposed.