At present, most rice color sorters on the market can basically achieve 99.99% color selection accuracy when the impurity content is 2%. In addition to the influence of impurity content on the color separation effect of the color separator, the output per unit time is also one of the key factors. The output is inversely proportional to the accuracy of the color separator, that is, the larger the output per unit time, the worse the color separation effect. Therefore, the color separator with the function of twice color separation can minimize the content of normal rice in the waste, save manpower, material resources and time, and help to improve the output and color separation accuracy of the color separator per unit time. The cream color should be polished before selection. The polished rice has less bran, white and bright surface and good fluidity, which is conducive to improving the color separation effect.