Preparation method of lemon essential oil

The invention relates to the field of essential oil preparation, and particularly relates to a preparation method of lemon essential oil, and the prepared lemon essential oil contains no additives, and is high in purity. The preparation method comprises the following steps: extracting lemon fruit oil to obtain an oil-water mixture; performing first centrifugal separation on the obtained oil-water mixture with the centrifugal speed of 8200rpm, the centrifugal time of 2-4 minutes and the centrifugation temperature of 80-100 DEG C to obtain crude oil; performing secondary centrifugal separation on the crude oil with the centrifugal speed of 6800rpm, the centrifugal time of 5-7 minutes and the centrifugation temperature of 80-100 DEG C to obtain the lemon essential oil. Before extracting of the lemon fruit oil, pesticide and heavy metal residue-free lemon fruits are selected, the selected lemon fruits are cleaned with 8-12m / h washing water, the cleaned lemon fruits are screened by use of a sorting machine to obtain lemon fruits with specified sizes, and the screened lemon fruits are free of insects, diseases and rotten fruits.