Multi-frequency-band piezoelectric vibration energy collector

The invention discloses a multi-frequency-band piezoelectric vibration energy collector which comprises a piezoelectric element, a cover plate, a dynamic absorber, an energy collecting circuit and a lateral wall, wherein the piezoelectric element is composed of a piezoelectric cantilever beam structure and a second piezoelectric stack; the piezoelectric cantilever beam structure consists of a piezoelectric sheet and a cantilever beam; the second piezoelectric stack is adhered to the lateral wall; the second piezoelectric stack is provided with the cover plate; the dynamic absorber comprises a mass block and an elastic element with the damping ratio less than 0.3, wherein the mass block and the elastic element are connected; and the elastic element comprises a fifth support, a sixth support and the cantilever beam. According to the invention, the working frequency can be designed in multiple frequency bands, and the collection of easily applied and efficient vibration energy can be realized.