The present invention relates to a method for preparing a cereal bran product containing beta-glucan. In accordance with the method, after the milling of cereal bran at least part of particles whose size is less than 70 to 100 µm are separated and removed from the process and particles whose size exceeds 300 to 600 µm undergo a new milling and classification, and the fraction passing the sifter in the classification is recovered.