Biodiesel refers to a renewable diesel fuel that can replace petrochemical diesel produced through a transesterification process using oil crops, wild oil plants and engineering and other aquatic plant oils, animal oils, and catering waste oil as raw material oils. Biodiesel is a type of biointelligence. It is a monoalkyl ester of long-chain fatty acids obtained from biomass using thermal cracking and other technologies. Biodiesel is a mixture of complex organic components with high oxygen content. These mixtures are mainly organic compounds with large molecular weights, including most types of oxygen-containing organic compounds, such as ethers, aldehydes, ketones, phenols, organic acids, alcohols, etc. Compound biodiesel is made from waste animal and vegetable oils, waste engine oil and refinery by-products, and then added with catalysts, and is synthesized through special equipment and special processes.