The invention relates to a low-frequency pressing type piezoelectric generator, which comprises a circular bottom plate, an annular wall surface, an upper metal base plate, a lower metal base plate, an upper piezoelectric patch, a lower piezoelectric patch, a hollow tube, a spring, a nylon ring and a connecting ring, wherein one sides of the annular wall surface, the hollow tube and the spring areall fixed on the circular bottom plate, the other sides of the annular wall surface, the hollow tube and the spring are connected with the lower metal base plate, the lower piezoelectric patch is adhered to the upper surface of the lower metal base plate, the upper piezoelectric patch is adhered to the lower surface of the upper metal base plate, the nylon ring is adhered to the lower piezoelectric patch, the connecting ring is adhered to the upper surface of the lower metal base plate, and one edge of the upper metal base plate is connected with the connecting ring. When the upper metal baseplate is pressed, the upper metal base plate is stressed to deform downwards, so that the upper piezoelectric patch adhered to the upper metal base plate is enabled to be in contact with the nylon ring and transmit excitation to the piezoelectric patch adhered to the lower metal base plate. The structure has the advantages of simple structure, labor saving and low cost, and the service life of the device is prolonged.