A micro piezoelectric windenergy harvester is put forward based on the mechanism of windinduced vibration, which would transfer the wind energy to the electricity. The device comprises a cavity and a piezofilm vibration sensor. A slender cylinder is attached at the free tip of piezoelectric film vibration beam, inducing the beam to vibrate because of the principle of vortexinduced vibration. Apart from the vortexinduced vibration, other types of windinduced vibration also contribute to the vibration of piezoelectric film. The size of device is 30 mm×16 mm×14 mm, and under the condition of 7 m/s wind speed with 1.8 MΩ resistance, the power is 0.84 μW. Meanwhile, the efficiency can be raised by increasing the number of piezoelectric film vibration beam.