The present invention relates to an air sterilization/purification device comprising: a chest-type casing having a suction port and a discharge port such that contaminated indoor air flows into the casing and purified air in a purified sate is discharged, the casing having a purification chamber for purifying contaminated air a fan motor contained in the casing to provide the suction port with a suction force, thereby moving contaminated air to the discharge port via the purification chamber at least one filtration filter installed on the suction port of the casing or the purification chamber to remove particulate materials in the contaminated air a photocatalyst module installed on the purification chamber of the casing to contact contaminated air inside the purification chamber, thereby sterilizing and deodorizing the contaminated air and an ion cluster generation module installed on the purification chamber to be adjacent to the discharge port of the casing and the photocatalyst module to provide purified air, which is discharged to the discharge port, with ion clusters, wherein the photocatalyst module comprises: a sterilization lamp for emitting UV rays and thereby sterilizing contaminated air a tube-type photocatalyst filter coupled to be fitted along the longitudinal direction of the sterilization lamp while being spaced from the outer peripheral surface of the sterilization lamp, thereby contacting contaminated air and ring-type spacers coupled to the outer peripheral surface of the sterilization lamp at even intervals to form a space for spacing between the photocatalyst filter and the sterilization lamp, and the spacers and the photocatalyst filter are formed to have elliptical sectional shapes, which have major axes in the direction of movement of contaminated air, thereby enlarging the air contact area for contacting contaminated air.Linvention concerne un dispositif de stérilisation/purification de lair comprenant : un boîtier de type coffre doté dun or
