The invention provides an instant food of germinated brown rice and a preparation method of the instant food, and belongs to the technical field of intensive processing of agricultural and sideline products. The instant food is characterized in that germinated brown rice is taken as the main raw material and is added with cane sugar (lactose, malt sugar, sugar alcohol or the like) and starch sugar to obtain instant powder or tablets of germinated brown rice. The preparation method comprises the following steps: the brown rice is germinated, dried, cooled and crushed, is subjected to moisture adjustment and extrusion, and is dried, crushed secondarily, mixed, sterilized and packaged to obtain the instant powder; and the power obtained through secondary crush is granulated, finished, sterilized and packaged to obtain the tablets. By the dry process that the instant powder is prepared through extrusion, nutrient substances of natural rice are reserved, absorptivity of a human body is increased, soaking, pulping, homogenizing and other procedures in the traditional wet process can be cut out; energy consumption is reduced; the process is simplified; pollution is reduced; and production cycle is shortened. The instant powder and tablets of germinated brown rice, prepared through the process, are rich in nutrient elements like Gamma- propalanine, phytic acid, dietary fiber and vitamins, are suitable for being taken by general population like children, students, office workers, patients and middle-aged and elderly people, are particularly suitable for overworking brain workers and people suffering from gastrointestinal dysfunction and obesity, are convenient to take and only need to be soaked in boiled water.