The invention relates to a method for preparing low heat nutritious instant rice paste by taking cereals as raw materials. The method comprises the steps of: washing rice, low fat peanut kernels and the like; drying at a low temperature, after smashing, mixing the smashed rice and low fat peanut kernels and the like uniformly with dialdehyde starch, resistant starch, dietary fiber, beta-carotene and animal albumen powder according to a ratio, frying the mixture until the mixture emits sweet smell, adjusting moisture, extruding the mixture at the low temperature, performing ultrafine grinding and secondary homogenizing, and performing vacuum packing to obtain finished products after microwave fluid bed drying and sterilizing. Compared with the available similar products, the rice paste has the advantages that the crude protein is higher by 2.79%-10.45%, the crude protein in vitro digestibility coefficient is higher by 5.9%-10.3%, the amino acid is higher by 2.65%-8.63%, the crude fat is lower by 2.48%-3.96%, the dietary fiber is higher by 2.42%-3.79%, a food energy value and a bioenergy value are respectively lower by 8%-15% and 14%-26%, the VA is higher by 0.59%-0.87%. The low heat nutritious instant rice paste has the beneficial effects of unique flavor and high nutrition, easy absorption, strong satiety, good water absorption property and reconstituability without clustering, and convenient eating, and especially suits the middle aged and elderly people, diabetes and obese patients, and has wide market prospect.