The invention discloses a method for preparing aniline through liquid-phase hydrogenation of nitrobenzene and belongs to the technical field of catalytic hydrogenation and organic synthesis. The method comprises the specific steps: adding a certain amount of a hydrogenation catalyst which is prepared through loading noble metal to carbon black as a carrier, and a solvent, i.e., aniline into a fluidized-bed hydrogenation reactor; and proportioning nitrobenzene and the aniline according to certain concentration, then, performing preheating to certain temperature, enabling the nitrobenzene and hydrogen gas to continuously enter the fluidized-bed hydrogenation reactor, and subjecting the nitrobenzene to a hydrogenation reaction under the catalysis of the noble-metal catalyst under the conditions of certain temperature, certain pressure and certain residence time, so as to produce the aniline and water. The conversion ratio of the nitrobenzene is higher than 99.99%, and the selectivity to the aniline is higher than 99.95%.