The present invention relates to a device for reducing ammonia gas using ozone water by which odors in a cattle shed are removed, the device comprising: an ozone water storing tank which stores ozone water therein and has a gas feeding hole, a purified water discharge hole, and an ozone gas discharge hole an ammonia gas supply pipe which is disposed between the ammonia gas feeding hole of the ozone water storing tank and the surface of the ozone water stored in the ozone water storing tank in order to transfer ammonia gas and has a ventilator equipped at the front end thereof an ozone water spray means which sprays the ozone water stored in the ozone water storing tank to the ammonia gas supply pipe so that the ammonia gas and ozone water forcibly come in contact with each other an ozone supply means which is stored in the ozone water storing tank and supplies ozone to the ozone water and an extra ozone removing means which is connected with the ozone gas discharge hole of the ozone water storing tank so as to remove extra ozone. By means of the device according to an embodiment of the present invention, the generation of ozone and the continuous circulation of ozone water are made possible so that high concentration ozone water can be maintained. Accordingly, viruses and bacteria in contaminated air can be sterilized and ammonia gas can be effectively oxidized and decomposed so that odors are removed. Moreover, by means of the present invention, an automatic gas circulation and purification technique is used so that a particular temperature in a cattle shed can be maintained compared to existing ventilation techniques. Therefore, contaminated air is not discharged to the outside so that environmental contamination can be prevented.본 발명은, 축사의 악취를 감축할 수 있도록 하는 오존수를 이용한 암모니아 가스 저감장치로,내부에 오존수를 저장하며 암모니아 가스 흡입구와 정화공기 배출구 및 오존가스 배출구를 구비하고 있는 오존수 저장탱크 상기 오존수 저장탱크의 암모니아 가스 흡입구와 오존수 저장탱크에 저장되는 오존수의 수면 사이에 배치되어 암모니아 가스를 이송하며 선단에 송풍기를 구비하고 있는 암모니아 가스 공급파이프 상기 오존수 저장탱크에 저장된 오존
