Ag6Si2O7, a visible light-driven photocatalyst, has attracted considerable attention owing to its enormous environmental remediation potential. In this work, a magnetic iron(II,III) oxide/titania/silver silicate (Fe3O4/TiO2/Ag6Si2O7) nanocomposite was synthesized by anchoring TiO2 and Ag6Si2O7 on the surface of Fe3O4 nanoparticles. The morphology, crystal structure, as well as the spectroscopic, magnetic, and photocurrent properties of the as-prepared Fe3O4/TiO2/Ag6Si2O7 nanocomposite were studied. Methylene blue (MB) was used for evaluating the photocatalytic performance under simulated visible light. The Brunauer–Emmett–Teller (BET) surface area, total pore volumes, and average pore diameter of the Fe3O4/TiO2/Ag6Si2O7 nanocomposite were calculated to be 33.077 m2/g, 0.099 cm3/g, and 15.45 nm, respectively. The Fe3O4/TiO2/Ag6Si2O7 photocatalyst showed a narrow-band-gap (1.38 eV) while exhibiting excellent photocatalytic performance with a photocurrent of 9.4 µA/cm2 under simulated visible light. Furthermore, the nanocomposites showed high resistance to degradation (i.e., more than 80%) after 5 reaction cycles and as a result of high saturation magnetization (25.51 emu/g), the spent material was easily separated upon application of a magnetic field. Meanwhile, the photogenerated holes (h+) and superoxide ions (O2−) were confirmed as the main active species. This novel photocatalyst is expected to provide a new insight into the design of photocatalysts with excellent recyclability, high performance, and good stability.