Preparation method of tea seed unsaturated fatty acid

The invention relates to a preparation method of tea seed unsaturated fatty acid. The method includes: taking tea seeds of tea production byproducts as raw materials, naturally drying tea seeds prior to hot-air drying and grinding, then subjecting ground tea seeds to supercritical CO2 extraction to collect tea seed oil, then subjecting the tea seed oil to acidification esterification and alkalization esterification reaction, and finally adopting a molecular distillation method to perform separation and purification to obtain the tea seed unsaturated fatty acid. Advanced technologies such as natural drying in the shade, supercritical CO2 extraction, molecular distillation and the like are integrated innovatively to efficiently extract the tea seed unsaturated fatty acid, tea seeds are turned into treasure from waste, high-quality raw materials are provided for developing functional oil and fat and beautifying and skincare oil, and the strategies of comprehensive utilization and recycling economy of limited resources are fully reflected.