The present invention relates to an air quality improving device for a railroad car, and more particularly, to an air quality improving device for a railroad car that purifies and discharges air inside the railroad car. To this end, the air quality improvement apparatus for a railway vehicle of the present invention includes an inlet through which external air is introduced; a cartridge filter mounted inside the inlet and filtering the introduced air; a sterilization module mounted in the empty space inside the cartridge filter and sterilizing the filtered air; a body coupled to the suction port; an in-line fan mounted inside the body, receiving sterilized air and blowing it to the outside; and a laminar flow wind guide for discharging the air blown by the inline fan to the outside.
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