The invention discloses a miscellaneous grain and miscellaneous bean instant noodles for children and a preparation method of the noodles, and belongs to the technical field of intensive processing of agricultural products. The instant noodles are creatively developed according to the basic principles of food nutriology, diet pagoda and characteristics of demand for nutritious food of children at age 2 to 12, and are characterized by the following aspects: wheat meal, maize meal or maize kernels are taken as the basic material; oat, buckwheat, millet, black kerneled rice, jumble beans and green beans are taken as auxiliary material; physical indexes including hardness, glutinosity, resilience, cohesiveness, elasticity, gumminess and chewiness are taken as product quality testing indicators; and the core technical parameters of preprocessing, mixing, extrusion, swelling, forming and drying of the basic and the auxiliary materials are optimized. The instant noodles are suitable for being taken by children at the age 2 to 12, do not need to be boiled at a high temperature, only need to be directly soaked in mild water or purified water for 15 to 25 minutes, have the characteristics of having balanced nutrient and being fast food, convenient, green, safe and easy to ingest, and can particularly meet food demand under irresistible natural disaster and special environment.