In this study, we synthesized γ-Fe 2 O 3 @SiO 2 @TiO 2 –Ag nanocomposites with a core–shell structure using a hydrothermal method and a sol–gel method. Transmission electron microscope images showed that the γ-Fe 2 O 3 @SiO 2 @TiO 2 –Ag nanocomposites had a core–shell structure. Photocatalytic examination of the γ-Fe 2 O 3 @SiO 2 @TiO 2 –Ag was carried out using methyl orange solution under UV irradiation. The γ-Fe 2 O 3 @SiO 2 @TiO 2 –Ag nanocomposites showed stronger photocatalytic activity than pure TiO 2 . With γ-Fe 2 O 3 @SiO 2 @TiO 2 –Ag, about 84% of the methyl orange was decomposed after 1h of UV irradiation, versus 49% for pure TiO 2 . The antibacterial activity of γ-Fe 2 O 3 @SiO 2 @TiO 2 –Ag nanocomposites was remarkably greater than that of bare TiO 2 nanoparticles. The introduction of silver nanoparticles into the TiO 2 matrix facilitates charge separation by trapping photo-generated electrons, thereby enhancing biological activity and photoactivity.