In order to make use of the piezoelectric generating device to collect the natural wind power, and to solve the defects of conventional piezoelectric generators restricted by external vibration source, a novel wind piezoelectric generator is designed. The generating voltage of the cantilever piezoelectric vibrator enclosed in the device is analyzed theoretically and the corresponding finite element verification is carried out. The results show that the theoretical results are consistent with the ANSYS simulation ones, and the error is only 0.54%. Based on this, the generating capacity of the novel wind piezoelectric generator is calculated by using ANSYS finite element software, and the results show that a cantilever piezoelectric vibrator can produce the voltage of 30.1 V under the simple harmonic force with the amplitude of 1 mm, frequency of 20 Hz. Finally, the structural parameters are optimized for obtaining the best generating performance. It is found that the device has the best power performance when the cantilever piezoelectric vibrator on the surface than wind axle CAM on convex point to the lowest point higher than 2 mm, and a cantilever piezoelectric vibrator will generate the output voltage of 60.3 V.