Optimization process for preparing small molecule protein peptide pig feed from defatted soybean meal

The invention discloses an optimization process for preparing small molecule protein peptide pig feed from defatted soybean meal. The defatted soybean meal is subjected to vacuum drying and is then subjected to ultrafine crushing; next, soybean peptides are separated from the defatted soybean meal; composite flavourzyme is used for thoroughly degrading bitter peptides into amino acid; the bitter taste of the peptide can be controlled; then, through the effect of bacillus natto, some bitter genes can be modified, transferred and recombined; in the fermentation process, metabolism and assimilation are performed between peptide amino acids; the soybean protein peptides are converted into small molecule active peptide. Meanwhile, through the matching with camellia oil, the storage performance can be effectively improved; the volatility is reduced; the stability is improved; meanwhile, the blood vessel elasticity and the toughness of the body can be enhanced; the gastrointestinal absorption function can be enhance