Bigleaf beautyberry leaf extractive and preparation method and medical application thereof

The invention discloses a bigleaf beautyberry leaf extractive and a preparation method and medical application thereof. The preparation method comprises the steps that (a), every 100 parts of medicinal materials comprise, by weight, 80-90 parts of dried bigleaf beautyberry leaves and 10-20 parts of dried codonopsis pilosula, the medicinal materials are mixed and smashed and subjected to heat reflux extraction with a 55% ethanol solution, the extracting solution is mixed and condensed till no alcohol taste exists, and an ethanol extracting concentrated solution is obtained; (b), the ethanol extracted concentrated solution obtained in the step (a) is diluted with water, extracted with petroleum ether, ethyl acetate and water-saturated n-butanol in sequence and decompressed and condensed, and a petroleum ether extract, an ethyl acetate extract and a n-butanol extract are obtained respectively; (c), the n-butanol extract is dissolved with water and filtered, activated ingredients are enriched by macroporous resin