Preparation method of mulberry leaf extract for treating diabetes

The invention discloses a preparation method of a mulberry leaf extract for treating diabetes, and relates to the field of traditional Chinese medicine preparation, and the specific method comprises the following steps: S1, cleaning mulberry leaves, drying, crushing the dried mulberry leaves, then mixing mulberry leaf fragments with ethanol, carrying out heating reflux extraction on the mixed liquid twice, then mixing the two extracting solutions, and filtering to obtain a filtrate; sequentially carrying out microfiltration and ultrafiltration on the extracting solution, and concentrating filtrate under reduced pressure until the mass of the filtrate is 0.5-1.5 times that of the folium mori to obtain an alcohol extracting solution; s2, filtering the alcohol extract obtained in the step S1, collecting filtrate as a to-be-extracted sample solution, and taking out solid mulberry leaf filter residues; and S3, mixing the solid mulberry leaf filter residues obtained in the step S2 with ethanol. The mulberry leaf ex