In order to solve the power supply difficulty of wireless sensor and the limited energy extraction efficiency of common standard circuit and synchronous switch circuit， an optimized adaptive mechanical synchronous switch is proposed and applied to the parallel synchronous switch inductance circuit. According to the principle of adaptive mechanical switch， a simulation model is established， and the adaptive mechanical synchronous switch is studied and analyzed under noise excitation. Corresponding experiments are also carried out， the experimental results show that the optimized adaptive mechanical switch circuit is adaptive to noise environment， and the load mean power harvested is around three times of the standard circuit. The self-adaptive mechanical switch can automatically detect the amplitude of the cantilever beam and control the switch to close near the displacement peak， which provides practical and theoretical guidance for the vibration energy generation device.