The invention discloses a multifunctional tenon-and-mortise-shaped piezoelectric vibrator and a preparation method thereof, and belongs to the field of piezoelectric materials. A multifunctional tenon-and-mortise-shaped piezoelectric vibrator comprises a tenon-shaped unit, a mortise-shaped unit, a connecting unit and an
electrode unit. And the tenon-shaped units are integrally processed. And the mortise-shaped units are integrally processed. And the tenon-shaped units and the mortise-shaped units are laminated and compounded along the thickness direction, so that double-resonant-
frequency coupling of a conductance curve is realized, and the purpose of
bandwidth expansion is achieved. The tenon-shaped unit and the mortise-shaped unit both comprise air gap modules, and the air gap modules do not contain
polymer materials, so that a high
electromechanical coupling coefficient can be generated, and the high-sensitivity receiving performance of the
transducer is met. The invention further provides a preparation method of the multifunctional tenon-and-mortise-shaped piezoelectric vibrator aiming at the tenon-and-mortise-shaped vibrator structure, the piezoelectric vibrator is integrally formed in a step-by-step
cutting-multiple filling mode, the method has the advantages of being simple in process, short in preparation period, low in cost and the like, and development of a high-performance receiving and transmitting small-size integrated
underwater acoustic
transducer and an array of the high-performance receiving and transmitting small-size integrated
underwater acoustic
transducer is facilitated.