Preparation method of Tricin

The invention belongs to the technical field of chemical analysis, and relates to a preparation method of Tricin. Aiming at the problems that the raw materials are not easy to obtain and the preparation process is complicated in the existing preparation method, the invention provides the preparation method of Tricin, which comprises the following steps: a, taking vinasse, extracting with an organic solvent, and concentrating to obtain a Tricin extracting solution; b, sequentially extracting the Tricin extracting solution with petroleum ether and ethyl acetate, collecting an ethyl acetate extracting solution, and concentrating to obtain an ethyl acetate extract; c, carrying out silica gel normal phase column chromatography on the ethyl acetate extract, collecting an eluent containing Tricin, and concentrating to obtain a crude product; and d, carrying out gel column chromatography on the crude product, collecting an eluent containing Tricin, and concentrating to obtain a pure Tricin product. According to the m