The invention discloses a loading type Pd
base metal nanometer cluster catalyst, a preparing method and applications thereof. The catalyst comprises Pd
metal nanometer particles of 1-25nm, or
bimetal or
polymetal nanometer particles containing Pd, and
ferric oxide nanometer particles, wherein the
ferric oxide nanometer particle is used as the carrier, has the primary particle size of 5-200nm, and has the general formula of FeyOx; the
bimetal or
polymetal nanometer particles are selected from one or a plurality of Pt, Rh, Ru, Os, Ir and Re; when the
metal nanometer particles are Pd nanometer particles, x / y is greater than 1, but is smaller than 4 / 3, or is greater than 4 / 3, but is smaller than 3 / 2; and when the
metal nanometer particles are
bimetal or
polymetal nanometer particles containing Pd, x / y is greater than 1, but is smaller than or equal to 3 / 2. The catalyst has excellent activity, selectivity and stability on the selective hydrogenating synthesis chlorinated arylamine of the chlorinated aromatic compounds, solves the problems of
hydrogenolysis and dechlorination of products in the process of the Pd catalyst catalyzing the chlorinated aromatic compounds to hydrogenate to prepare the chlorinated arylamine, and has important industrial application values.