The present invention relates to an apparatus for producing a feed additive including mold rice as an active ingredient and a producing method thereof, and more specifically, to a feed additive invented to be added to an animal feed for farm animals such as cattle, pigs, etc., in a predetermined ratio and fed to farm animals so as to enhance: weight gain in farm animals during breeding periods efficiency of the animal feed an immune system to fight digestive diseases in farm animals and quality of meat. The producing method of the present invention comprises: a grinding step of grinding rice in a grinder (10) to be ground into a particle size of the rice equal to or greater than 2 mm a transferring step in which the ground rice particles are transferred to a supply regulator (30) by a transferring hopper (20) a water supply step in which water is supplied to the rice particles to be supplied to the supply regulator (30) through a water pipe (40), wherein the rice and water is in the ratio of 1:0.4 to 1 a gelatinization step in which the rice particles mixed with water in the predetermined ratio are supplied through a compression gelatinizing device (50) and gelatinized by heat and pressure applied when the rice particles are compressed and transferred by screws (51) a cooling step in which the gelatinized rice particles are cooled to the room temperature a starter mixing step in which a yeast starter developed in a potato dextrose agar (PDA) medium added with a rice extract is inputted and mixed a cultivation step in which the yeast starter is cultured at room temperature for 24 hours a drying and cooling step in which the cultured yeast starter is dried and cooled simultaneous at the room temperature for eight hours and a grinding step in which the yeast starter is ground to be powder, wherein the producing method is carried out sequentially.COPYRIGHT KIPO 2016본 발명은 쌀 누룩을 유효성분으로 하는 사료첨가제의 제조장치 및 방법에 관한 것으로, 더욱 상세하게는 소, 돼지 등 가축의 사료에 정해진 비율로 첨가하여 급여할 수 있도록 함으로써, 사육기간
