The invention relates to a supported nanometer nickel catalyst, which adopts isopyknic impregnation method and loads active metal components on the carrier, with the active metal content from 0.1 percent to 5 percent. And then the active metal induces the metal nickel in nickel and phosphorus bath to deposit to yield high activity supported nanometer nickel catalyst with 15 percent content of active component nickel. The catalyst used to prepare 2, 5-dichloroaniline from chloronitrophen added with hydrogen yields high hydrogen activity. Especially when UCZHJ is used a reaction promoter, the reaction yield reaches 100 percent, and the catalyst can be used repeatedly.