A novel photocatalyst, namely BiOBr/Fe-Mt, was synthesized successfully via the combination of Fe-modified montmorillonite with BiOBr at low temperature. The as-prepared BiOBr/Fe-Mt composites were characterized by the techniques of X-ray diffraction(XRD), transmission electron microscopy(TEM), Fourier transform infrared spectroscopy(FTIR) and UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS). The batch experiments of Rhodamine B(RhB) degradation in solution under visible light(λ>400 nm) by the catalysts were carried out to evaluate the photocatalytic activities. Under the condition with the same supporter mass amount of 2.5 g, BiOBr/Fe-Mt catalyst showed a higher photocatalystic capacity as compared with BiOBr/Na-Mt. The significantly enhanced photocatalysis may be ascribed to the following two main reasons:① the decrease of band gap(Eg) of Fe-Mt/BiOBr to 2.46 eV, and/or the possible formation of BiOBr/iron oxide heterojunction structure; and ② just less residue of cetyltrimethylammonium bromide that can provide the source of bromide ion in BiOBr/Fe-Mt composite. These structural factors would effectively promote the photocatalystic degradation of RhB over BiOBr/Fe-Mt catalyst.