Abstract: With the development of society, underground cables are becoming more and more important in urban construction. However, due to the complex distribution of underground cables and insufficient supervision, there are many accidents by external force damage often occur. This article introduces a variety of underground cable protection solutions proposed at this stage and analyses their advantages and disadvantages. Among them, the early warning protection solutions based on sounds sensors are most suitable for the application of underground cable protection. At present, the early warning protection solutions based on sound sensors mainly use voiceprint recognition technology. This article proposes the combination of sound source localization technology and voiceprint recognition technology, introduces some characteristics of various sound source localization technologies, and obtains a sound source based on Time Difference of Arrival (TDOA) is the feasibility of positioning technology in underground cable protection.