The invention discloses a method for preparing aromatic amine by an aromatic ketone one-pot method. The method comprises the following steps: uniformly mixing a protonic acid catalyst with aromatic ketone, wherein the molar ratio of the protonic acid catalyst to aromatic ketone is (0.5-8):1; adding hydroxylamine hydrochloride into the obtained mixed solution, wherein the molar ratio of hydroxylamine hydrochloride to a carbonyl group of aromatic ketone is (1-2):1; raising the temperature under a stirring condition to 60-140 DEG C for a reaction; adding hydrochloric acid after finish of the reaction to hydrolyze a generated amide group into an amino; and performing cooling and crystallization to obtain aromatic amine. Polyphosphoric acid, concentrated sulfuric acid and methanesulfonic acid are adopted for catalysis to prepare aromatic amine in one step. Compared with a conventional method, the method provided by the invention has the advantages that reaction steps are reduced, the technological process is greatly simplified, the period is shortened, the cost is lowered, and the efficiency and the productivity are remarkably improved.