Disclosed is an air separation system for ironworks. According to an embodiment of the present invention, the air separation system for ironworks, which compresses air filtered by an air filter in an air compressor and separates gas through a water energy cooling tower, an adsorber and an expansion turbine, comprises: a filter housing installed with the air filter; a water tank arranged below the filter housing and filled with a fluid; and a shielding wall covering the circumference of the air filter, extended from the filter housing toward the water tank and forming a path of external air sucked into the air filter by forming a fixed gap with the water level of cooling water filled in the water tank.
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