Garlic oil extraction mainly adopts the traditional steam distillation method. Its main production process is made by using high-quality sesame oil as a solvent and melting allicin. During the process, it is selected, soaked, peeled, pulped, liquefied, constant temperature, centrifuged, and distilled. Multi-process preparation such as filtration. This method has complicated procedures and requires proper temperature, which makes it extremely easy to lose effective active ingredients. At present, the technology of supercritical carbon dioxide extraction garlic oil developed in China has made a breakthrough and can realize industrialized production. The specific process is as follows: In a system with cooler, pre-heater and heater, a certain amount of garlic is put into the extractor, and then the carbon dioxide cylinder is turned on. The carbon dioxide is pumped out by the pressurizing pump and heated to the place by the pre-heater. After the temperature is required, it enters the extractor, and the materials after extraction are separated by the separator. After research, it is found that the appropriate extraction pressure is 16MPa and the extraction temperature is 35 degrees Celsius; the optimal extraction time is 3h.