The present invention is designed to sustainably sterilize the air and the inner mask to disintegrate the DNA of the virus regardless of the size or type of the bacteria to prevent infectious diseases and respiratory diseases； A personal hygiene mask equipped with an optical filter device. A characteristic constitution of the present invention therefor includes: an outer housing which adheres to the contour of the face and maintains a shape； An air passage coupled to an outer side of the outer housing and formed of a plurality of holes through which air to breathe is passed； A light source module that serves to decompose the DNA of the virus in the air passing through for breathing by irradiating a light having a disinfection wavelength inside the air passage； A power switch for applying power to the light source module described above, a power supply source for supplying power to the light source module described above； An optical filter is constructed by combining a power converter that converts the current and voltage output from the above-described power supply source into a current and voltage suitable for the above-described light source module. On the other hand, the inside of the outer housing that maintains the shape of the mask； An inner mask is constructed and combined with the mask outer housing by a combination, which serves to prevent light from being directly irradiated to the skin, to filter out harmful floats, and to act as a photocatalyst to maintain lasting antimicrobial properties. . According to the configuration of the present invention described above； UV light of the sterilizing wavelength is stably emitted through the light source module, and the emitted light is always sterilizing the breathing air and the inner mask； In addition to the economic effect of prolonging the expiration date of the mask, and the environmental pollution prevention effect of reducing the amount of waste, the wear-and-detachment structure has the effect of allowing
