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Aiming at the working principle of a certain type of underwater unmanned equipment sonar transmitter and the problems of outdated detection methods and insufficient detection capabilities of existing sonar transmitters, an automatic testing system for underwater unmanned equipment sonar transmitters based on a domestic PXI bus instrument platform was designed; Firstly, the working principle and detection requirements of the transmitter were analyzed, and the overall design of the sonar transmitter automatic testing system was carried out; Secondly, it introduces the implementation methods and key technologies of the software and hardware platform of the automatic test system, including the selection of domestic PXI bus instruments, the design of interface units, the design and implementation of the Software architecture of the test platform, and the design and implementation of data processing algorithms; Finally, analyze the experimental results of the sonar transmitter automatic testing system; The application results show that the system can realize the measurement of the main parameters of a certain type of underwater unmanned sonar transmitter. Compared with the traditional test methods, the automatic test system can save a lot of test time and manpower, achieve the maximum improvement of the Test effort effect, and prevent the adverse impact of human factors on the test results.