NOVELTY - The method comprises feeding materials comprising 4-AD, absolute ethanol, triethyl orthoformate and pyridine hydrobromide at a ratio of 1:1:0.8:0.005:0.02, introducing the absolute ethanol and triethyl orthoformate into a reaction tank, adding 4-AD to be dissolved and then adding pyridine hydrobromide, controlling and reacting the mixture at 42-45 degrees C for 7.5-8.5 hours, cooling the mixture and then controlling at 0-5 degrees C, holding the temperature, and stirring the mixture for 0.8-1.2 hours and then performing freeze crystallization at 0 plus minus 2 degrees C and centrifuging.    USE - The method is useful for preparing testosterone enanthate.    ADVANTAGE - The method is capable of easily and simply preparing the testosterone enanthate with improved purity and yield in an economical and eco-friendly manner.    DETAILED DESCRIPTION - The method comprises feeding materials comprising 4-AD, absolute ethanol, triethyl orthoformate and pyridine hydrobromide at a ratio of 1:1:0.8:0.005:0.02, introducing the absolute ethanol and triethyl orthoformate into a reaction tank, adding 4-AD to be dissolved and then adding pyridine hydrobromide, controlling and reacting the mixture at 42-45 degrees C for 7.5-8.5 hours, cooling the mixture and then controlling at 0-5 degrees C, holding the temperature and stirring the mixture for 0.8-1.2 hours and then performing freeze crystallization at 0 plus minus 2 degrees C and centrifuging the obtained products to obtain an ether compound, feeding obtained ether compound, sodium borohydride or potassium borohydride, methanol, 12% of hydrochloric acid and sodium hydroxide at a ratio of 1:0.15:10:0.8:0.5:0.8, cooling the ether compound and methanol at 0 plus minus 2 degrees C and then stirring, adding sodium borohydride or potassium borohydride in batches with in 0.8-1.2 hours and then keeping at -2 degrees C to -5 degrees C, reacting the mixture for 0.8-1.2 hours, regulating at 10 plus minus 5 degrees C, adding 12% of hydrochloric acid for regulating the pH to 1.8-2.2, keeping the temperature and reacting the mixture for 0.8-1.2 hours, regulating the pH to 7 using sodium hydroxide, adding water, concentrating and separating out and centrifuging the mixture to obtain the testosterone, where the feeding materials comprises testosterone, benzene, pyridine, heptanoyl chloride, methanol, 12% of hydrochloric acid at a ratio of 1:6:1:0.8:3.5:0.6:0.12, taking the testosterone, benzene and pyridine into the reaction tank and then dissolving at 5-10 degrees C, dripping the heptanoyl chloride and then controlling at 5-10 degrees C for 0.8-1.2 hours, keeping the solution for 0.45-0.55 hours and then pumping in 12% of hydrochloric acid, stirring the mixture for 0.24-0.26 hours and allowing to stand for 0.24-0.26 hours, separating the water layer, concentrating the liquid in vacuum drying, pumping the liquid in methanol and slowly heating the mixture at 50 degrees C and dissolving all the materials, filtering the mixture, and crystallizing and centrifuging the filtrate.