The invention relates to miscellaneous grain noodles and a preparation process thereof, in particular to noodles with miscellaneous grain as the raw material and a preparation process thereof. The miscellaneous grain noodles are prepared with buckwheat, pea, mung bean, grain sorghum, millet and corn as the raw materials; the percent of all the raw materials in the total weight is as follows: 30 percent to 35 percent of buckwheat, 20 percent to 25 percent of pea, 15 percent to 25 percent of mung bean, 1 percent to 20 percent of grain sorghum, 1 percent to 15 percent of millet and 1 percent to 15 percent of corn. The preparation process of the miscellaneous grain noodles comprises steps, such as raw material selection, milling, mixing, pasting, sheet shaping, cooking and curing, drying, cutting, cooking, packaging, etc. The miscellaneous grain noodles have consistent appearance and form, are not glutinous, are flexible and elastic to touch, are soft and not glutinous and not easy to be broken after being cooked, have smooth taste, are convenient to be eaten, have reasonable nutrition structure, are in particular applicable to the diabetic, high blood pressure and high fat patients and people who want to lose weight, and have the functions of dietotherapy and health care. The preparation process of the miscellaneous grain noodles is mainly completed by professional machines and devices, has high production efficiency, good environment sanitation, and the product quality is easy to be controlled.