A　series　of　1.5-2　μm　Pt/Bi2WO6　composite　microflowers　(mass　concentration:　0.5%Pt,　1%Pt,　2%Pt,　4%Pt)　assembled　by　Bi2WO6　nanosquares　were　synthesized　by　a　hydrothermal　synthesis　combination　with　photo-deposition　method.　The　as-synthesized　microflowers　were　investigated　by　photocatalytic　reaction　and　characterized　by　powder　X-ray　diffraction　(XRD),　N2-physical　adsorption,　scanning　electron　microscopy　(SEM),　transmission　electron　microscopy　(TEM),　UV-Vis　diffuse　reflectance　spectra　(DRS),　X-ray　photoelectron　spectroscopy　(XPS)　and　Fourier　transform　infrared　(FT-IR).　The　results　showed　that　these　hierarchical　Pt/Bi2WO6　composite　microflowers　have　superior　texture　property　in　aqueous　photocatalytic　reactions.　Moreover,　the　deposited　Pt　nanoparticles　(NPs)　play　an　important　role　in　promoting　the　photocatalytic　performance　in　degradation　of　acid　orange　II　under　visible　light　(λ　>　420　nm)　irradiation.　The　deposition　of　optimal　amount　of　1%Pt　brings　about　2.8　times　increase　in　activity.　The　deposited　Pt　NPs　over　Bi2WO6　nanosquares　enhance　the　visible　light　absorption,　decrease　the　recombination　rate　of　e-/h+　pairs　and　promote　OH　radicals　production,　hence　largely　boosting　the　photocatalytic　activity.　Moreover,　the　unique　hierarchical　structures　of　Pt/Bi2WO6　microflowers　benefit　their　separation　and　recycle　in　aqueous　photocatalytic　reactions.　©　2015　Elsevier　B.V.　All　rights　reserved.