Abstract: In the sonar system, the underwater acoustic transmitter is usually implemented by discrete devices such as power and drive. Furthermore, for the improvement of circuit reliability, various protection circuits and monitoring circuits need to be designed, which makes the transmitter circuit design complicated and increased in volume. In order to solve this problem, this paper proposes using FPGA as a digital control chip to complete the signal generation, control, communication and other functions of the transmitter, and the intelligent power module (IPM) is used as a power-level intelligent sonar transmitter scheme. In order to reduce the source level fluctuation in the working bandwidth, improve the performance of the transmitter and match the transducer load, the circuit design scheme of the transmitter is given in this paper. The electrical performance test of the transmitter and the sound source level test in the pool are conducted, and the results show that the digital transmitter has the advantages of stability, reliability, multiple protection functions, and small size. The design scheme proposed in this paper has a good application prospect in the field of underwater acoustic transmitters.