The invention relates to a large-power ultrasonic transducer. The large-power ultrasonic transducer is characterized by comprising a protective barrel, an upper connector, a lower connector, an upperprotective cap, a pressure balance and a lower protective cap, wherein the two ends of the protective barrel are connected with one end of the upper connector and one end of the lower connector respectively, the other end of the upper connector is connected with the upper protective cap, and the other end of the lower connector is connected with the lower protective cap through the pressure balance. According to the large-power ultrasonic transducer, piezoelectric ceramic is directly and compactly assembled with the protective barrel, hindering of an intermediate medium is eliminated, ultrasonic propagation efficiency is greatly improved, and blockage-removing efficiency and the blockage-removing effect of an oil well can be improved after application.