The invention belongs to the technical field of instant food, and provides mint-pinellia tuber instant cereal flour and a preparation method thereof, which aim to solve the problems of the existing instant noodles that nutritional ingredients are less, serious adverse effect on the body of consumers eating existing instant noodles for a long time are caused due to addition of lots of preservatives and other chemical ingredients for prolonging the shelf life. The mint-pinellia tuber instant cereal flour is prepared from white flour, corn flour, sorghum flour, millet, soybeans, black soybeans, pinellia tuber, Chinese wolfberry, kidney beans, black sesame, gastrodia elata, minced fillet and mint according to a certain proportion. The mint-pinellia tuber instant cereal flour can be brewed and cooked and thus is convenient to eat; the white flour, corn flour, sorghum flour and millet are taken as main raw materials, and due to addition of beans such as soybeans, black soybeans, kidney beans and black sesame, the mint-pinellia tuber instant cereal flour contain more nutrients and is rich in the mouth feeling; due to the addition of minced fillet, meat and vegetables in the product are well matched and the nutrients are complete and balanced; through the addition of pinellia tuber, Chinese wolfberry and gastrodia elata, the instant flour has the health efficacy; and through the addition of mint, the product is cool and refreshing, and is popular with consumers.