The invention discloses a miniature directional ultrasonic transducer which comprises a piezoelectric material layer. The top surface of the piezoelectric material layer is provided with an upper electrode, and the bottom surface is provided with a lower electrode. An insulating layer covers the top surface of the upper electrode. A silicon dioxide layer covers the bottom surface of the lower electrode. The bottom surface of the lower electrode is supported through a silicon substrate. The invention further discloses a processing technique of the miniature direction ultrasonic transducer. The miniature directional ultrasonic transducer has advantages of small size, easy integration, high usefulness and high suitability for miniature equipment. Furthermore the miniature directional ultrasonic transducer can be process according to MEMS technology.