Method for preparing memantine hydrochloride

The invention discloses a method for preparing memantine hydrochloride. The method is characterized in that the method provided by the invention uses 1-bromo-3,5-dimethyladamantane (represented by a general formula IV in the description) as a starting material which is subjected to an amination reaction with acetamine to obtain a key intermediate 1-actamido-3,5-dimethyladmantane (represented by a general formula III in the description); the compound represented by the general formula III is subjected to alcoholysis in a mixture system of inorganic base and n-butyl alcohol for deacetylated to obtain memantine; memantine is treated using hydrochloric acid in a ketone solvent to obtain memantine hydrochloride. The method provided by the invention overcomes deficiencies in the prior art and has the advantages that the raw materials are simple and readily available, the reaction steps are simple and short, and the operations are convenient and fast, therefore, the method is suitable for industrial production.