The invention provides a mixed-grain convenient nutritional granular wheaten food which comprises the following components in parts by weight: 13-17 parts of oat powder, 10-14 parts of millet flour, 8-12 parts of wheat powder, 8-12 parts of coix seed powder, 8-12 parts of buckwheat powder, 5-9 parts of sorghum flour, 5-9 parts of green bean, 5-9 parts of small red bean, 4-8 parts of black bean, 4-8 parts of pea, 3-7 parts of carrot powder, 1-5 parts of spinach powder and 0.5-3.5 parts of salt. A method for producing the wheaten food comprises the steps as follows: selecting bean materials according to the preset proportion, peeling, drying and grinding; and mixing other materials with the bean materials according to the proportion, adding water, stirring into a dough, granulating, puffing, drying, classifying, detecting and packaging. The wheaten food provided by the invention is balanced in nutrition and good in reconstitution properties, and is very suitable for modern fast pace of life.