Industrial production method of exemestane

An industrial production method of exemestane comprises the following steps: adding androsta-1,4-diene-3,17-dione, anhydrous ethanol, triethyl orthoformate and p-toluenesulfonic acid into a reactor, stirring above added materials, carrying out rotary drying, and crystallizing the obtained dried mixture to obtain an intermediate YXMT01; sequentially adding the intermediate YXMT01, anhydrous ethanol, tetrahydrofuran, 37% formaldehyde, N-toluidine and p-toluenesulfonic acid into the reactor, and carrying out rotary drying to obtain an intermediate YXMT02; sequentially adding the intermediate YXMT02, ethyl acetate and hydrochloric acid into the reactor, precipitating, carrying out suction filtration to obtain white solid, and re-crystallizing the white solid with toluene to obtain an intermediate YXMT03; and sequentially adding the intermediate YXMT03, toluene and IBX into the reactor, stirring the added substances, cooling the obtained substance, concentrating the obtained filtrate, and re-crystallizing the obtained concentrate to obtain white solid YXMT. The method has the advantages of avoiding of uncontrollability of a one-kettle method in industrial production, cheap sources of raw materials, easiness in control of the process operation, high yield, stable quality, and suitableness for industrial production.