The invention discloses a frequency-boosting piezoelectric-electromagnetic composite power generation apparatus under vortex street excitation, and aims to overcome the limitations of narrow energy harvesting frequency band, only realization of efficient energy harvesting in resonance frequency, and low energy density of the current linear pneumatic piezoelectric power generator. The frequency-boosting piezoelectric-electromagnetic composite power generation apparatus comprises a rectangular container cavity, a vortex street excitation apparatus, a limiting shaft and a rectangular coil; the vortex street excitation apparatus and the limiting shaft are mounted in the rectangular container cavity; and the rectangular coil is glued at the back end of the interior of the rectangular containercavity. The vortex street excitation apparatus performs high-frequency vibration under excitation of a low-frequency high-pressure gas, and a magnet at the tail end cuts the rectangular coil to realize electromagnetic power generation; and meanwhile, the vortex street excitation apparatus is in collision with the limiting shaft in the movement process, so that cantilever beam deformation is causedto realize piezoelectric power generation. By virtue of a cylindrical turbulent flow effect, the vibration frequency of the piezoelectric element and the magnet can be improved, and by combination ofpiezoelectric power generation and electromagnetic power generation, the energy harvesting bandwidth of the power generation apparatus is expanded, and energy density is improved, so that the frequency-boosting piezoelectric-electromagnetic composite power generation apparatus has wide application prospect in the field of the pneumatic technology.