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Magnetic BiOBr/Fe 3 O 4 /RGO composites with remarkable photocatalytic capability were prepared by a simple hydrothermal method to load 3D flower-like microspherical BiOBr onto the surface of Fe 3 O 4 /RGO. Under visible-light irradiation ( λ > 420 nm), the BiOBr/Fe 3 O 4 /RGO composite with 56% mass percentage of Fe 3 O 4 /RGO shows the optimal removal ability for Rhodamine B, and the total removal efficiency is 96%. The coupling of Fe 3 O 4 /RGO and BiOBr elevates the conduction band of BiOBr, which enhances the reduction level of BiOBr/Fe 3 O 4 /RGO composites. Ultimately, based on experiments and theoretical calculations, an n-type Schottky contact formed at the heterojunction interface between RGO doped with Fe 3 O 4 and BiOBr is proposed for photoexcited charge transfer. The RGO with great adsorptivity plays a major role in the photocatalysts composed of BiOBr, RGO and Fe 3 O 4 . Further, BiOBr/Fe 3 O 4 /RGO composites with permanent-magnetism can be recovered and reused easily by external magnetic field and maintain a total removal efficiency of 90% after four cycles., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)