Lipid transesterification is the transesterification of oils, and transesterification of oils refers to the transesterification or molecular rearrangement process caused by the interaction of triglycerides in oils with fatty acids, alcohol itself or other esters. Through transesterification, the composition, structure and properties of glycerides in oils can be changed to produce natural oils with new structures, or some natural oils that people want to obtain to meet certain needs. It can also produce monoglycerides, diglycerides and other esters other than glycerides. Transesterification, hydrogenation and fractionation are the three basic processes of petroleum modification.