The invention relates to a deep hydrogenation pretreatment method for heavy distillate oil, which is characterized in that the heavy distillate oil is used as raw material to catalytically produce top-grade lubricating base oil, wherein the reaction temperature is from 300 to 400 DEG C, the hydrogen partial pressure is from 10.0 to 15.0MPa, the volume space velocity is from 0.5h<-1> to 3.0h<-1>, and the hydrogen-oil volume ratio is from 300:1 to 1000:1; a catalyst takes auxiliary-modified silica-alumina composite oxide and alumina as carrier with molybdenum and/or tungsten and nickel and/or cobalt being loaded, pseudo boehmite is dissolved with nitric acid, and silicon oxide and oxidized auxiliary are added to obtain auxiliary-modified silica-alumina gel; the silicon oxide and the auxiliary-modified silica-alumina composite gel are kneaded to obtain the carrier; and the carrier is dipped in solution containing active metal components to obtain the catalyst. The catalyst has great hydrogenation reaction activity and is suitable for the hydrogenation treatment of the heavy distillate oil, especially for the deep hydrogenation pretreatment aiming at the production of top-grade lubricating oil.