The present invention relates to a pig breeding system including an odor reducing device. More specifically, the system includes: a wastewater tank part for temporarily storing excretions discharged from a pigsty to be used for breeding pig； a solid-liquid separating part for separating solids and liquid from the excretions stored in the wastewater tank part； a microorganism injecting part for injecting microorganisms into the separated liquid of the solid-liquid separating part； a fermenting and aerating part for fermenting the liquid containing the microorganisms after having gone through the microorganism injecting part； a precipitating part for separating precipitates from the liquid treated by the fermenting and aerating part； a treatment and storage part for storing the liquid from which the precipitates have been removed through the precipitating part； a liquefied fertilizer storage part for separating and storing some of the liquid stored in the treatment and storage part to manufacture a liquefied fertilizer； and a circulating part for separating the rest of the liquid stored in the treatment and storage part to move the liquid to the pigsty. The liquid moved to the pigsty is mixed with the excretions of the pigsty to be made to flow into the wastewater tank part, and this process is repeated. According to the present invention, a liquefied fertilizer is generated through the treatment of the excretions, but the microorganisms are used to reduce odor, and also, the treated liquid is used to discharge the excretions, and thus, the system is capable of considerably lowering the mortality rate of pigs by maintaining a clean breeding environment with reduced odor.본 발명은 악취저감 장치를 포함하는 돼지사육시스템에 관한 것으로, 더욱 상세하게는 가축을 사육하기 위한 축사에서 배출되는 분뇨를 임시저장하기 위한 원수조부, 상기 원수조부에 저장된 분뇨를 고액분리하기 위한 고액분리부, 상기 고액분리부에서 분리된 액체에 미생물을 투입시키기 위한 미생물투입부, 상기 미생물투입부를 거쳐 미생물이 투입된 액체의 발효와 처리를 위한 발효폭기부, 상기 발효폭기부에서 처리된 액체가 유입되어 침전물을 분리하기 위한 침전부, 상기 침전부를 거쳐 침전물이 제거된 액체를 저장하기 위한 처리저장부, 액체비료 제조를 위해 상기
