method for preparing cinacalcet hydrochloride having the steps of heating - 1 - naphthyl ethylamine and 3 - benzene wherein l is a halogen atom , methanesulfonate group , p - toluenesulfonate , or triflate , in an organic solvent in presence of an inorganic base , refluxing until 3 - benzene is completely consumed , obtaining a reaction mixture containing cinacalcet , and after treatment , obtaining cinacalcet hydrochloride having a formula of the post treatment separates - 1 - naphthyl ethylamine hydrochloride and cinacalcet hydrochloride by adjusting ph value , extraction , and other simple operations , and the - 1 - naphthyl ethylamine obtained is recycled for preparing the next batch of cinacalcet hydrochloride .