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Sonar is widely used, marine fisheries and military applications make sonar technology greatly developed. The real-time and reliability of the data transmission by the underwater part of sonar makes sonar system performance guaranteed.In this paper, a DWDM photoelectric switching module for data transmission in the underwater part of sonar was designed. In this module, the Ethernet switching chip and two DWDM optical modules was used to make sure that the data forwarded over multiple channels and the backup of the optical path realized which improved the system reliability and make the network topology more flexible.The DWDM optical module can convert the electrical signal to an optical signal whose wavelength can be selected. Through the use of a number of modules, multiplexing of optical signals can be realized in order that data transmitting by a number of underwater cables at the same time can be achieved. After development and testing, the Ethernet service performance indicators of this module meet the design requirements. The module has been used in a sonar project and can provide design reference for other engineering applications.