The structural design of semiconductor photocatalyst is a key factor to achieve high-efficient dye wastewater purification, in which the common drawbacks of weak redox kinetics, fast carrier recombination and insufficient optical response should be addressed, but still challenging. Herein, using two-step hydrothermal/solvothermal process, a direct Z-scheme heterostructured photocatalyst is newly constructed by coupling Cu2ZnSnS4 (CZTS) and BiOBr (BOB) nanosheets. Under the synergistic action of the narrow-gap photosensitive characteristics of CZTS and BOB's intrinsic interlayered electric field, such Z-scheme CZTS/BOB can possess significantly enhanced photocatalytic activity for photo-degrading methyl orange, having the highest degradation efficiency of up to 99% within 40 min with the degradation rate of 0.0907 min−1, which is about 3.3 and 37.8 times higher compared with the bare BOB (0.0273 min−1) and CZTS (0.0024 min−1), respectively. Through detailed analysis, such direct Z-scheme heterostructures can facilitate to broaden visible light response, efficiently separate photogenerated carriers, inhibit recombination and enhance the redox capacity as well, thus contributing to the improved photocatalytic efficiency. This study might provide a new idea for the construction of BOB-based high efficiency catalysts.