Photocatalytic reduction of aqueous Cr(VI) was successfully achieved on nanostructured SnIn 4 S 8 . The SnIn 4 S 8 particles with flower-like nanostructure were synthesized via a facile solvothermal method. UV–vis diffuse reflectance spectra (DRS) indicated that the SnIn 4 S 8 particles had strong absorption in visible region and the band gap was estimated to be from 2.27 to 2.35eV. The photocatalytic reduction of aqueous Cr(VI) by flower-like SnIn 4 S 8 was evaluated under visible light (λ>400nm) irradiation. The polyvinyl pyrrolidone (PVP) assisted SnIn 4 S 8 sample exhibits excellent removal efficiency of Cr(VI) (∼97%) and good photocatalytic stability. The predominant photocatalytic activity is due to its large surface area, strong absorption in visible-light region and excellent charge separation characteristics.