Preparation method of composite rich in ajoene

The invention discloses a preparation method of a composite rich in ajoene. The preparation method comprises the following steps of transforming natural alliin extracted from garlic into diallyl thiosulfinate by taking alliinase as a catalyst; carrying out membrane concentration, extraction, separation and enrichment, and then reacting and purifying to obtain a high-content ajoene product. The preparation method disclosed by the invention has the advantages of available process raw materials, easily controlled production process conditions and high product purity.