The invention relates to the technical field of bioseparation and particularly discloses an extracting method of citrus essential oil. The method comprises the following steps that citrus peels are dried in the shade and smashed into powder, an extracting agent composed of dimethyl ether and ethane is added, and the mixture is extracted ultrasonically; the feed liquid mixture subjected to ultrasonic treatment is placed into a high-voltage pulse electric field to be extracted; the feed liquid mixture subjected to treatment in the high-voltage pulse electric field is subjected to subcritical extraction with organic solvent and water as extracting agents, and the extracting agents are removed, so that the citrus terpene removal essential oil is obtained. According to the extracting method of the citrus essential oil, in the extracting process, the required temperature and pressure are low, it can be ensured that aroma components in the essential oil are not damaged while the good terpene substance removal effect is achieved, the essential oil extracting yield is high, the technology is simple, and the equipment cost is low; the extract liquor obtained after subcritical solvent extraction has recycling value and can be widely used for preparing limonene.