The invention discloses a method for preparing a hydrofining catalyst. According to the hydrofining catalyst, firstly, a mixed solution A containing Ni and W and a sodium metaaluminate alkaline solution react in a parallel flow manner, obtained slurry is aged, then, a mixed solution B containing W, Mo and Al components and ammonia water are added to the aged slurry in a parallel flow manner, agingis performed, then, first drying, forming and second drying are performed, treatment is performed with a mixed aqueous solution of aluminum salt and organic acid, washing, third drying, calcination and other steps are performed, and the hydrofining catalyst is prepared. The catalyst can be applied to super deep hydrodesulfurization and hydrodenitrification reactions of diesel fractions, has higher hydrodesulfurization and hydrodenitrification reaction activity and is particularly applied to tretament of diesel materials with high nitrogen and sulfur content.