The present invention provides a large-field-strength and high-reliability piezoelectric ceramic element comprising a copper substrate on the bottom layer, an intermediate layer disposed piezoelectric ceramic, an adhesive layer connecting the piezoelectric ceramic firmly onto the copper substrate. The copper substrate is connected with a first pin, and the upper surface and lower surface of the piezoelectric ceramic are coated with silver electrode layers whose diameters are no greater than that of the piezoelectric ceramic; and the silver electrode layers are connected to a metal substrate through conductive adhesives. The metal substrate is welded with a second pin. Accordingly, the present invention also provides an application of the piezoelectric ceramic element. In the invention, the silver electrode layers are connected to a metal substrate through conductive adhesives, and the second pin is welded on the metal substrate, so as to avoid direct contact with the silver electrode layers during the soldering of pins, which produces thermal shocks to crack the piezoelectric ceramic; as a result, the reliability of the performance of piezoelectric pumps can be effectively improved and the suitable electric field strength and life of piezoelectric pumps are increased.