The frequency of ocean wave energy is low (0.3~1 Hz), and the highspeed airflow is generated when the ocean waves enter the oscillating water column chamber to compress the air. A cylindrical blunt body is placed in the highspeed airflow channel, and the Karman vortex street effect is used to increase the excitation frequency of the wave energy oscillating water column for collecting the air pressure in the air chamber, so as to realize highfrequency piezoelectric power generation and improve the efficiency of ocean energy conversion. The waterhydrodynamic conversion theory of waves entering into the chamber to form oscillation, and the initial pressure and floe velocity of the chamber are calculated. The frequencyincreasing process of Karman vortex street high frequency eddy current excitation formed by the lowfrequency and highpressure air flow passing through the blunt body is analyzed. The output power of the cymbaltype piezoelectric generation structure driven by air pressure is calculated. The relationship between the system parameters such as gas velocity and blunt body and the output energy is studied. The calculation results show that the electric energy of 70~80 mW can be output steadily when the ocean wave with a period of 0.65~1.1 s enters into the air chamber and acts on the cymbal piezoelectric power generation structure after increasing the frequency. This study provides a theoretical basis for the new wave energy harvesting technology.