Pretreatment material through the scraper conveyer into leaching plant sealed packing auger, fall into the flat turn leacher, leaching solvent or a mixed spray oil. Drain and wet meal fall into fall meal bucket by a scraper conveyor through a sealing packing auger steamed into the offline. After steaming and baking, the solvent is transported to the finished product. Through leaching device filter thick mixed oil into mixing tank, after re entering the evaporator solvent vapor is separated into the second long tube evaporator, after again separated solvent vapor, into the stripper for removing residual solvent, the income of the extracted crude oil into crude oil tank, to refining workshop. From the first long pipe and the second long tube evaporator, stripper, flat turn leacher, desolventizer toaster solvent vapor into the condenser, the condensation liquid inflow water separator diversion, the separation solvent to solvent flow. The wastewater discharged from a water separator and a solvent base into the boiling water pot turnover by boiling and then discharged into the water seal tank. The free gas at the upper part of each device is condensed into the final condenser, and the non condensing gas is then absorbed into the absorption tower to capture the solvent.