Abstract: Disclosed is a method for preparing ajoene including: (a) obtaining garlic pulp or garlic extract from garlic; (b) mixing the garlic pulp or garlic extract with animal lipid to form a reaction mixture; and (c) heating the reaction mixture to obtain ajoene. The ajoene prepared according to the present disclosure may be encapsulated with gelatin. According to the present disclosure, ajoene can be prepared with a yield 2 times or more than that of the existing methods. Thus, ajoene can be provided as active ingredient for foods and medicines more cost-effectively. Also, the production protocol according to the present disclosure is suitable for large-scale production of ajoene.