An aspect of the present invention relates to an air filtration system, and more specifically, to a double side-drying air filtration system having a device for injecting drying gas of high temperature and high pressure, which comprises: a cleaning solution supply unit supplying a cleaning solution for cleaning an air filter; a high-temperature and high-pressure drying gas supply unit supplying compressed and temperature-increased drying gas of high temperature and high pressure to the air filter; a filter assembly installed on the air filter to make contaminated air pass through the air filter, collect foreign materials included in the contaminated air to the air filter, and remove the foreign materials from the contaminated air, wherein a cleaning solution is supplied from the cleaning solution supply unit, and drying gas of high temperature and high pressure is supplied simultaneously to both one side surface and the other side surface of the air filter from the high-temperature and high-pressure drying gas supply unit; and a group of pipes allowing fluid from at least one of the cleaning solution supply unit and the high-temperature and high-pressure drying gas supply unit to be in fluid communication with the filter assembly. Additionally, the high-temperature and high-pressure drying gas supply unit simultaneously compresses air of a room temperature and increases the temperature thereof, wherein the air of room temperature performs rotational flow in the high-temperature and high-pressure drying gas supply unit such that the air is compressed and the temperature of the same is increased. The present invention can increase cleaning and drying efficiency.
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