The invention discloses a chemical synthesizing method for 1,2-diglyceride. The method is characterized by comprising the following steps: (a) reacting benzyl glycidyl ether and fatty acid under the effect of a proper catalyst, thereby acquiring 1,2-fatty acid-3-benzyloxy glyceride; (b) removing protecting group by hydrogenating 1,2-fatty acid-3-benzyloxy glyceride under the catalytic effect of palladium carbon, thereby acquiring a rough product of diglyceride fatty acid, and then re-crystallizing under low temperature, thereby acquiring 1,2-diglyceride fatty acid with high yield above 90% and high purity above 90%. According to the method, the synthesizing route is simple and convenient, the post-processing is simple, the total yield is high (above 75%) and 1,2-diglyceride fatty acid can be effectively synthesized.