The present invention relates to a cattle feed aging system. More specifically, the system includes: a hot water boiler producing hot water； a heat storage chamber storing the hot water produced from the hot water boiler； a circulation pipe circulating the hot water stored in the heat storage chamber through a circulation pump； a plurality of branch tubes connected in parallel with the circulation tube； an insertion tube including a body having the upper part opened and having the lower part formed into a tube to be vertically inserted into a black plastic bag storing cattle feed, a heat delivery substance stored in the body, a packing member combined with the upper part of the body to be packed with the black plastic bag, a hot water tube connected to each of the branch pipes to circulate the hot water, supplied from the heat storage chamber through the circulation tube and the branch tubes, to exchange heat with the heat delivery substance, and a temperature sensor installed in the body to measure the temperature of the heat delivery substance； and a controller supplying and heating the hot water to the hot water tube of the insertion tube when the temperature of the cattle feed gets lowered to no more than a reference temperature after the measurement of the temperature of the temperature sensor. As such, when an internal temperature of the black plastic bag gets lowered to no more than a reference temperature, water, heated in the hot water boiler, is delivered into the black plastic bag through the insertion tube and the internal temperature gets increased, and thus, the present invention is capable of smoothing the fermentation process by maintaining temperature conditions in which microorganisms are able to live.본 발명은 소 사료 숙성 시스템에 관한 것으로서, 특히 온수를 생산하는 온수 보일러와； 상기 온수 보일러에서 생산된 온수를 저장하는 축열조와； 상기 축열조에 저장된 온수를 순환 펌프를 통해 순환시키는 순환관과； 상기 순환관에 병렬 연결되어 복수의 분기관과； 각각의 톤백 내부에서 소 사료가 담긴 검정 비닐봉지 내부에 수직으로 삽입되도록 상부가 개방되고, 하단이 원추형으로 형성된 관 형태로 형성되는 본체와, 상기 본체 내부에 충진되는 열전달 물질과,
