The invention discloses a hydrogenation catalyst. The hydrogenation catalyst comprises a tooth ball-shaped alumina carrier, and group VIB metal components and group VIII metal components loaded on the tooth ball-shaped alumina carrier, wherein the pore volume and the specific surface area of the tooth ball-shaped alumina carrier are 0.4-0.7mL/g and 180-280m<2>/g respectively. The invention also provides a preparation method of the hydrogenation catalyst, and a light oil hydrofining method. The hydrogenation catalyst can be used in coker gasoline hydrofining apparatuses, can fully perform its hydrogenation performance, can effectively maintain the pressure drop stability of the system of a hydrogenation apparatus and can prolong of the running period of the hydrogenation apparatus.