The invention relates to a method for separating a brown rice peel layer. The method comprises the first step of cleaning the rice, namely, large, small and light impurities and the like easy to clean are cleaned from unprocessed grain, the magnetic impurity in the rice is removed, rice particles are separated from barnyard grass particles, and the rice is separated from stones; the second step of rice hulling, namely, rice hulls are removed through a rice huller, the rice hulls are separated out from the rice processed by the rice huller, and brown rice and the rice are sorted from the brown rice mixture through a brown rice screen sieve; the third step of dampening, namely, the content of the moisture of the brown rice is adjusted into 14%-15% of the total weight through the water mist or the water vapor, and the dampening time duration ranges from 6 minutes to 18 minutes; the fourth step of rice milling, namely, an emery roll rice husking machine is used for removing outer bran layers of the rice particles and an iron roll air blast rice husking machine is used for removing the brown rice peel layer; the fifth step of brown rice peel layer collecting, the grinded white rice is separated from the brown rice peel layer, and the brown rice peel layer is collected. The accurate dampening moisture part and dampening time control are carried out on hulled clean brown rice through a water atomizing method, the emery roll rice husking machine arranged in the middle of a first rice machine and the iron roll air blast rice husking machine arranged in a tail rice machine are selected in a combined mode to be connected in series for grinding, the brown rice is subjected to soft grinding force, the integrity of the peel layer is kept high, the effect of high peel producing ratio is achieved when the brown rice peel layer is separated, and the technique is simple and easy to control.