a method of neutralizing an amine gas odor in a cold box process , and an amine gas generator using the method are disclosed . the method includes : making molding sand by mixing sand and forming resin ; putting the molding sand into a mold ; hardening the molding sand by injecting an amine gas into the molding sand in the mold ; and removing an amine gas odor remaining in the mold by injecting an amine gas odor neutralizer into the mold . accordingly , it is possible to inject an amine gas odor neutralizer in casting of a core or a mold in order to reduce the amine gas odor that remains and leaks through a gap of a mold in the casting . further , an odor neutralizer is immediately injected simultaneously with discharging of an amine gas , so it is possible to simply remove an odor .