The present invention relates to an auditory information security system and, more specifically, to an auditory information security system for preventing illegal leakage of auditory information by transmitting security signals, which are unspecified noise signals within a preset frequency band among frequency bands that the human ear cannot hear, and then, preventing the auditory information, including voices and sounds occurring in a specific area where wiretapping or recording is expected, from being collected by a wiretap or recorder.