Environmental vibration energy collection is expected to solve the power supply problem of wireless sensor nodes with micro power consumption. Aiming at the problem that typical piezoelectric vibrational energy capture device is mainly linear resonant system with narrow working frequency band and difficult to adapt to the actual vibration source. Vibration characteristics of energy collector with a two-beam permanent magnet structure are studied. Magnetic model is established using magnetic dipole theory

and used to lumped parameter dynamics model. The influence rule of key parameters of system on response is analyzed by simulation and analysis. Finally

the experimental platform is set up to verify the theoretical results. Research results show that the energy capture efficiency of the dual-beam wide-band piezoelectric energy capture device is improved under the action of coupling magnetic field. When the magnetic spacing is 26 mm

the energy capture range is expanded by three times

and the voltage output is increased evidently.