A method for low-level laser irradiation for hearing loss reversal includes: generating low-frequency laser light controlling an output intensity of the generated laser light determining whether or not the wavelength and output of the laser light coincides with a preset reference wavelength and reference output intensity, respectively and irradiating with the laser light into an inner ear through an external auditory meatus, wherein the reference wavelength is set in the range of 600 nm to 10,000 nm.
