The invention relates to a method for synthesizing chloroaniline and particularly relates to a method and a catalyst for synthesizing chloroaniline from chloronitrobenzene by virtue of selective catalytic hydrogenation. According to the method, a supported noble metal catalyst is utilized, hydrogen serves as a hydrogen source, chloronitrobenzene is subjected to selective hydrogenation in a liquid phase system to generate chloroaniline, and the selective hydrogenation process is presented by the following formula in the specification by virtue of liquid chromatography-mass spectrometric detection. The method is high in efficiency and reaction selectivity, mild in reaction condition and low in cost, and the operation is easily controlled.
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