Abstract: The present disclosure discloses a brown rice and oat bread with low glycemic index and a preparation method thereof, which belongs to the technical field of grain processing. The brown rice and oat bread provided by the present disclosure includes the following ingredients: brown rice flour, gluten powder, oat flour, butter, sodium caseinate, salt, yeast, improver, and water. According to the present disclosure, the sodium caseinate is used to help form a dough and improve the flavor of the bread, and the brown rice and oat bread with low glycemic index is obtained with the brown rice bread recipe and special baking process, which is close to wheat bread in terms of specific volume, taste and tissue structure.