PURPOSE: A fermenter for fodder is provided to be able to use drying wind by re-circulating the drying wind discharged from a vent into the inside of the drum.CONSTITUTION: A drying wind re-circulating apparatus(100) re-circulates drying wind flowed in via a condenser, into a drum by heating up to a predetermined temperature. A first filer section(110) filters foreign substances contained in the drying wind discharged from the drum(20). Multiple filters installed in the first filter section have different mesh sizes in order to gradually filter foreign substances in the drying wind from a coarse to fine particles. The condenser(120) condenses the vapor in the drying wind flowed in, and discharges the condensed water to a condensed water vent(121) formed on one side of the hopper shaped bottom. An outdoor unit(123) re-supplies a refrigerant to a evaporator by compressing the refrigerant which has absorbed the heat of the drying wind, condensing the compressed refrigerant before expanding. A heating part(130) heats up the drying wind flowed in via the condenser to a predetermined temperature, and re-circulates the wind to the drum. A second filter section(200) removes bad smells, foreign substances, or bacteria in the drying wind circulating to the drying wind re-circulation apparatus. A pump(300) supplies liquid materials containing microorganisms into the second filter section. A third filter section(400) is connected to the second filter section, and discharges the partial drying wind to outside while removing the foreign substances and the microorganisms in the discharged drying wind. A microwave oscillating apparatus is installed in the state of passing through at least one point of the drum, and heats up the material inside the drum. A cooling fan(530) is installed in the rear side of the microwave oscillating apparatus.COPYRIGHT KIPO 2013본 발명은 본체 내부에 드럼이 설치되어 있고, 상기 드럼 중심에는 스크루가 축 설치되어, 상기 드럼 내부로 재료를 공급하면서 스크루로 혼합한 후 배출시키는 한편, 상기 드럼 내부로 상기 재료를 발효시키기 위한 건조풍을 공급하
