Method for preparing hypotensive mulberry leaf tea bag

The invention provides a method for preparing a hypotensive mulberry leaf tea bag. The method comprises the following steps: removing stalks of fresh mulberry leaves, cleaning the fresh mulberry leaves, pulping and adding protease; performing ultrasonic assisted enzymolysis, and centrifuging after enzymolysis; concentrating supernatant of an enzymolysis product, and lyophilizing to obtain mulberry protein antihypertensive peptide; mixing and blending the mulberry protein antihypertensive peptide and mulberry leaf tea powder; packaging, and sterilizing to obtain the hypotensive mulberry leaf tea bag. The problem of mulberry leaf protein is difficult to hydrolyze due to the existence of pectin can be solved by utilizing ultrasonic wave application in the enzymolysis process, so that the ACE (angiotensin converting enzyme) inhibition activity of the mulberry protein enzymatic hydrolysate can be increased, and the IC 50 (half inhibit concentration) value is 1.12-2.76mg/mL.