Abstract: This paper discussed current development state of noise localization devices, which were characteristic of large size and high cost. The authors have developed a new portable sound source localization system which is using MATLAB as a programming language and having operator interface integrated by Microsoft.NET services. With four-dimensional array and Newton iterative algorithm, the system has made remedy for the decrease in accuracy due to the small number of sensors with smaller search steps and space structure. Experiments have shown that the system can realize three-dimensional sound source localization in any spatial orientation with an average relative error of 11.75%, which can meet the requirements of industrial acoustic emission detection.