Based on test research of available energy in tunnel environment, the paper designs one piezoelectric cantilever beam power generation device which is suitable for tunnel environment. To the vibration spectrum characteristics of underground tunnel environment, the paper chooses high-efficiency and high cost performance piezoelectric materials, by using finite element method for simulation research, to design the piezoelectric cantilever beam with right size and materials. Based on these research, the paper designs peripheral circuit of acquisition system, to realize the function that gathering the vibration energy which transformed by piezoelectric devices in low-cost way.