The invention provides a preparation method for memantine hydrochloride. The method comprises the following steps: reducing 1-nitro-3,5-dimethyl adamantane in the presence of a weak acid by taking iron powder as a reducer, so as to obtain memantine; and acidifying the obtained memantine into a salt, thereby obtaining the memantine hydrochloride. The preparation method provided by the invention is simple and is applicable to the industrial-scale production of the memantine hydrochloride; the iron powder serves as the reducer, so that the risk of explosion resulted from the catalytic hydrogenated reduction of nitro by Pd/C is avoided; and meanwhile, process operating steps are simplified, and the production capacity is improved, so that the yield of the memantine hydrochloride reaches 83% or more, and the product purity is 99.8% or more.