In this work, a series of BiFeO₃/ZnO composites with varying molar ratio of BiFeO₃ to ZnO (Bi:Zn = 2.5:1, 5:1, 10:1, 20:1) have been synthesized via a one-step hydrothermal method and evaluated for their efficiency in rhodamine B (RhB) degradation performance. The morphology results reveal that the microsphere-shaped ZnO is dispersed on the surface of the blocky-like BiFeO₃, with intimate contact between the two phases. It has been found that the maximum piezocatalytic activity could be achieved at BiFeO₃/ZnO molar ratio of 5:1, with a degradation rate up to 92% for RhB. Compared with pure BiFeO₃ and ZnO, the composites have superior piezocatalytic degradation performance. The reason for the enhanced piezocatalytic dye degradation rate may be that the BiFeO₃/ZnO composites effectively separate the positive and negative charges to reduce the recombination of positive and negative charges. These active species, such as superoxide radicals (O2??) in the process of piezocatalytic, are proved on the active species capture experiments. The BiFeO₃/ZnO composites have good piezocatalytic degradation performance, which provides an option for collecting vibration energy to degradation dye wastewater in the future.