This study focuses on the notch effect on FeCo/Ni clad plate cantilevers. We investigated the response of the cantilevers to an external load and the energy conversion performance. The three-point bending test well demonstrated that the presence of notches can broaden the variation of magnetic induction with respect to an external load. Furthermore, this variation is proportional to the load. The maximum output voltage of the notched FeCo/Ni clad plate cantilever is 2.4 times that of the cantilever without a notch. The following vibration energy harvesting experiment also revealed that the output voltage of the former was far greater than that of the FeCo/Ni clad plate cantilever without a notch by a factor of 2. The result of finite element analysis (FEA) indicated that the improvement of the energy harvesting performance was the result of localized stress concentration around the notches in response to an external load. In addition, the FeCo/Ni clad plate cantilever showed a superposed enhancement of the energy harvesting performance compared with a single FeCo plate cantilever as a result of the different properties of the FeCo and Ni alloys.