Catalytic esterification method of oil with high acid value

The invention discloses a catalytic esterification method of oil with a high acid value, relating to the esterification of higher fatty acid and providing a catalytic esterification method of oil with a high acid value. The method comprise the steps of: adding oil with a high acid value and an esterifying water carrying agent into a reactor and stirring, when reaching a preset reaction temperature, adding a catalyst, and reacting to obtain obtaining a reactant. The oil with the high acid value can be at least one selecting from waste oil, gleditsia sinensis lam, waste catering oil, hogwash oil, animal and plant oil containing the higher fatty acid and the higher fatty acid; the esterifying water carrying agent can be selected from low-carbon alcohol and can be added with glycerol; The low-carbon alcohol is distilled off in azeotropy with water, which ensures that the reaction balance moves to the right and a solid-acid catalyst has improved reaction efficiency and prolonged service life; the glycerol is used as an esterifying agent and can be subjected to reaction at higher temperature so as to improve esterification efficiency. Solid superacid is used as the catalyst with no sidereaction, easy separation with a product, reusability and low production cost; and moreover, the method has high reactivity, fast speed and mild conditions.