The invention discloses coarse cereal rice, and belongs to the field of food processing. The main points of a technical scheme are as follows: the raw materials comprise the following components in parts by weight: 0.5-2 parts of red beans, 0.5-2 parts of mung beans, 0.5-2 parts of black rice, 0.5-2 parts of oat rice, 0.5-2 parts of corn, 0.5-2 parts of brown rice, 0.2-0.7 parts of coix seeds, and0-8 parts of rice. The invention also discloses a method for preparing the multigrain rice. The method comprises the following steps: the coarse cereals are immersed for 2-10 hours at 40-55 DEG C respectively; the coarse cereals are respectively drained; the red beans are treated with microwave at 10000 to 15000 W for 900 to 1500 s, the mung beans are treated with microwave at 400 to 600 W for 480 to 700 s, and the other coarse cereals are treated with microwave at 600 to 1250 W for 30 to 100 s. the finished product is mixed, and the finished coarse cereal rice is steamed and cooked rice, thesteaming process is simple, the steaming time is short, and the needs of the fast steaming of cooked rice for the consumers are met.