The invention relates to a wind-induced vibration piezoelectric energy collecting device. The wind-induced vibration piezoelectric energy collecting device comprises a left fixing part, a first sliding block component, flow preventing cylinders, a windward thin plate, a bent beam, a piezoelectric cantilever beam component, bolts, a right fixing part, supporting rods, a second sliding block component and a pre-press spring. The ends of the four supporting rods are fixedly arranged on the four corners of the left fixing part and the four corners of the right fixing part through the bolts respectively, the windward thin plate is fixed between the first sliding block component and the second sliding block component, and the flow preventing cylinders are fixedly arranged at the two ends of the windward thin plate respectively. Notches are formed in the middle of the second sliding block component and the middle of the right fixing part respectively, and the two ends of the bent beam are fixedly arranged in the notches of the second sliding block component and the right fixing part respectively. The prepress spring is installed between the first sliding block component and the left fixing part. The piezoelectric cantilever beam component is fixed to one or two sides of the middle of the bent beam. Even when the wind-induced vibration piezoelectric energy collecting device is located on an occasion with the low wind speed, the piezoelectric component can also generate large vibration, a large amount of electric energy can be outputted, and the wind energy collecting efficiency is effectively improved.