Method for preparing goat milk active drink with cell envelope proteinase of lactobacillus bulgaricus

The invention provides a method for preparing a goat milk active drink with cell envelope proteinase of lactobacillus bulgaricus. According to the method, goat milk is used as a raw material, and thecell envelope proteinase of GRAS microbe, namely lactobacillus bulgaricus, is used as a biocatalyst; protein in the goat milk is hydrolyzed into oligopeptides having ACE inhibitory activity, and the effect of assisting blood pressure reduction is achieved when a consumer takes the goat milk active drink; hovenia acerba polysaccharides added into the goat milk active drink have the effect of a stabilizing agent and the effect of reducing blood glucose, and can be used for improving the functionality of the goat milk active drink; synanthrin added into the goat milk active drink used as prebiotics can be used for promoting multiplication of intestinal probiotics and absorption of nutritional substances; and erythritol and xylitol serving as functional sugar alcohols have the characteristicsof low sweetness, low heat