Preparation method for peanut meal and natto sauce

The invention provides a preparation method for peanut meal and natto sauce in order to improve the taste and the flavor of existing natto and increase the nutritional components of a natto product. The preparation method mainly comprises the steps of pretreatment of raw materials, immersion, stewing, cooling, inoculation, fermentation and product storage, and is characterized in that the high-quality natto sauce with the peanut flavor is produced by combining three food materials, including peanut meal, soybeans and oat, which have high nutritional values into a production technology for natto, and changing the species and the C/N ratio of a fermentation substrate in a fermentation process without affecting the kinase activity of the natto, so that the nutritional components of the natto, the peanuts and the oat are retained to the maximum extent, the flavor of the natto is improved, and the ammonia smell and the bitterness of the natto are greatly weakened. The produced natto sauce with the peanut flavor is