The invention relates to a novel extraction process of dalbergiae oil through super (sub) critical carbon dioxide. Extraction processes of the dalbergiae oil through supercritical carbon dioxide carrying ethanol entrainer reported in literature have the problems of being difficult to remove the entrainer, having quite difficult subsequent treatment, and influencing the product quality. The invention provides an efficient extraction method without needing to use the entrainer. Good process conditions are obtained through optimizing the extraction temperature, pressure, time, and the flow rate of the carbon dioxide, wherein the extraction temperature is 20-55 DEG C, the extraction pressure is 20-35MPa, the temperature of an analytical kettle is 40-60 DEG C, the pressure of the analytical kettle is 6-12MPa, the extraction time is 1-2h, the flow of the carbon dioxide is 20-40L/h, and the yield of the obtained extract is 1.28% which is higher than the extraction yield (1.05%) reported in the literature. As a super (sub) critical carbon dioxide fluid is adopted in the invention, the extraction speed is quick, and the yield is high; and the extraction process is efficient, saves energy, is safe, has no toxicity, and leads to no pollution on the environment.