NOVELTY - Extracting apramycin comprises adsorbing Streptomyces tenebrarius fermentation liquor for producing carbamyl tobramycin to a first cation resin, eluting with a first eluant, collecting the eluant to obtain a crude solution of carbamyl tobramycin containing apramycin, processing hydrolysis of the crude solution of carbamyl tobramycin containing apramycin by heating at 80-90 degrees C for 1-3 hours to obtain a crude solution of tobramycin containing apramycin, adsorbing the crude solution of tobramycin containing apramycin to a second cation resin, and eluting with a second eluant.    USE - The method is useful for extracting apramycin, which is useful in livestock and poultry breeding field.    ADVANTAGE - The method is capable of economically extracting the apramycin without impurities in an environmentally friendly manner.    DETAILED DESCRIPTION - Extracting apramycin comprises adsorbing Streptomyces tenebrarius fermentation liquor for producing carbamyl tobramycin to a first cation resin, eluting with a first eluant, collecting the eluant to obtain a crude solution of carbamyl tobramycin containing apramycin, processing hydrolysis of the crude solution of carbamyl tobramycin containing apramycin by heating at 80-90 degrees C for 1-3 hours to obtain a crude solution of tobramycin containing apramycin, adsorbing the crude solution of tobramycin containing apramycin to a second cation resin, eluting with a second eluant, collecting the eluant containing apramycin to obtain an apramycin solution, and purifying the obtained apramycin solution. The fermentation liquor is processed by acidizing to pH value of 5-6, adsorbing with the first cation resin and eluting with ammonia water. The first cation resin is strong acid styrene cation exchange resin. The tobramycin crude solution containing apramycin is processed by adjusting pH value to 8-9, adsorbing with the second cation resin and eluting with ammonia water. The eluant is monitored by thin-layer chromatography in the process of eluting with ammonia water. The thin-layer chromatography takes pure apramycin as standard point location, when the point location of the testing solution of the eluant fits for that of the apramycin. The apramycin solution is purified by connecting the second cation exchange resin and the third anion exchange resin and is crystallized to obtain the apramycin. The second cation exchange resin is macroporous acrylic acid weak-acid cation-exchange resin. The third anion exchange resin is strong-alkalinity styrene anion exchange resin.