The invention discloses a supercritical extracting method of ginger oil. The ginger oil is extracted from ginger by adopting supercritical carbon dioxide fluid. Before extracting, ginger is selected,washed, dried and pulverized, the extracting temperature is 25-65 DEG C, and the pressure is 15-28 MPa; the flow of carbon dioxide gas passing through an extracting kettle is 1.0-1.3 t/h, and the extracting time is 2-4 h. The carbon dioxide fluid under the supercritical state is used as an extracting solvent, the solvent is recycled in the same system, the solvent consumption is small, the price is cheap, and thus the extracting cost is low. The carbon dioxide fluid is green pollution-free solvent, the extracted ginger oil has the advantages of being high in quality and purity, good in color,free of peculiar smell, solvent residue and environmental pollution and the like, the extracting cycle is short, residues after the ginger oil is extracted also contain effective components like starch and dietary fiber, and the ginger can be comprehensively utilized. The technology is simple, and the energy consumption is low.