Means a plant essential oil extraction echelon

The present invention provides an apparatus echelon extraction of essential oils, including an evaporator built bed material, suction pump, condensing the gas circulating means and the gas heating unit, and product collection tank, and wherein the gas is condensed gas circulating heating means is a semiconductor coupling configuration refrigeration apparatus, refrigerant cold side of the semiconductor device as a gas condensing device, circulating the hot gas side as the heating means, peltier semiconductor device comprises an N-stage refrigeration unit formed in series, in the first stage to the second stage N-1 peltier cooling unit entrance side stream, are provided across the line, connected to the hot side of the semiconductor refrigeration unit reflux stream inlet with a valve for adjusting the temperature difference between the cold side of the semiconductor refrigeration unit and a hot side; this means essential oils as needed echelon extracted fractions, the desired condensation temperature providing heating and refrigeration and heat, to ensure that devices have higher energy efficiency, rational energy use, lower operating costs.