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A sound source localization system was designed for the screening and localization of specific sound sources in some complex scenarios. The system uses STM32 as the main control chip and the time differences of arrival (TDOA) algorithm as the basic principle. For possible situations such as low signal-to-noise ratio, impractical linearity, and multipath effects, fuzzy sets are first used to filter and process the collected audio data to enhance signal anti-interference and obtain ideal audio data. Afterwards, the grid iteration method is used to estimate the sound source coordinates. Under the same conditions, experimental comparisons were made with traditional TDOA algorithms, and the results showed that the entire system had better anti-interference and higher positioning accuracy compared to traditional algorithms when locating specific frequency audio, achieving the expected goals.