The invention discloses a hydrogenation catalyst composition and a preparation method thereof. The hydrogenation catalyst composition comprises an aluminum
oxide carrier, an active
metal and an auxiliary agent, wherein the active
metal is selected from one or more of VIII family and / or VIB family metallic elements, and the auxiliary agent is selected from one or two of
silicon or
zirconium; the concentration of
silicon and / or
zirconium in the catalyst, in the form of oxides, are gradually increased from centers to outer surfaces of catalyst particles, wherein the concentration of
silicon and / or
zirconium at a position of 1 / 3R of particles is 0.1-0.5wt%, the concentration of silicon and / or zirconium at a position of 2 / 3R is 0.5-1.0wt%, the concentration of silicon and / or zirconium at a position of R is 1.0-3.0wt%, and R is the semi-
diameter of the catalyst particles by taking the center of the catalyst as an
initial point. The catalyst prepared by adopting an impinging
stream co-
precipitation gel forming mode in the invention is centralized in
particle size distribution, and has an ideal pore structure, and the auxiliary agent and the active
metal are distributed in the catalyst in a
gradient increase mode, so that the deactivation rate of the catalyst can be effectively reduced, and the desulfurization and
denitrification capacities of the catalyst are improved.