Catering waste has a large production volume, high fat content, high salt content, and is prone to decay and odor, accounting for 40% to 60% of urban solid waste. Currently, anaerobic fermentation, aerobic composting, and the production of biofuels, biopesticides, and simple chemicals can utilize the biomass in catering waste to some extent. However, these methods generally rely heavily on microbial processes, resulting in long reaction times and low yields. Additionally, due to the high storage requirements for explosive by-products, the large amount of residue and liquid with low secondary utilization rates, and the significant external energy consumption, their engineering application is temporarily difficult to achieve. Although catering waste contains a high water content, it is prone to decay, emit odors, and harbor pathogens, its organic matter accounts for 80% to 90% of the dry basis, with sugars and proteins making up about 71%, making it a valuable biomass resource. Under certain conditions, it can be used as a raw material for synthesizing hydroxy fatty acids (HA) or polyhydroxyalkanoates (PHA). Therefore, it is expected that its existing treatment and disposal difficulties can be changed through organic polymerization. This achievement targets the characteristics of high organic matter, high salt content, and high grease in China's kitchen waste, utilizing oxidation or reduction reactions to direct large molecular organic substances into hydroxy fatty acid monomers, and ultimately polymerize them to form polyhydroxyalkanoates (PHA). It aims to obtain novel structural PHA molecules, improve the yield of PHA, separation and purification efficiency, and reduce production costs. It also addresses issues such as long fermentation cycles and difficulty in selecting strains, providing necessary scientific basis and technical support for the development of resource utilization technologies for kitchen waste.