Preparation method of oryzanol

The invention provides a preparation method of oryzanol. The preparation method comprises the following steps: (a) extracting an oryzanol-containing extracting solution from an oryzanol-containing raw material by using a supercritical fluid; (b) separating out a precipitate containing oryzanol from the extract containing oryzanol in a solid-liquid separation manner; and (c) purifying the oryzanol from the precipitate containing the oryzanol. 本申请提供一种谷维素的制备方法，包含下列步骤：(a)以超临界流体由含谷维素的原料中萃取出含谷维素萃取液；(b)由所述含谷维素萃取液中以固液分离方式分离出含谷维素沉淀物；及(c)由所述含谷维素沉淀物中纯化出谷维素。