The invention relates to a hydrotreatment catalyst and an application thereof. The catalyst comprises a heat-resisting inorganic oxide carrier containing carbon and hydrogenation active metal components loaded on the carrier. The catalyst is characterized in that the hydrogenation active metal components are nickel, molybdenum and tungsten. The carrier is prepared through a method comprising the steps of mixing the heat-resisting inorganic oxide and/or a precursor of the heat-resisting inorganic oxide and carbon black powder and/or a precursor of carbon, and performing molding, drying and activation. The activating step comprises the following processes: (1) in the absence of air and/or in the presence of inert gas, the dried molded product is subjected to a heating treatment, wherein the temperature of the heating treatment is 400-800 DEG C and a treatment time is 0.5-8h; (2) under a water vapor and/or carbon dioxide atmosphere, the product obtained in the step (1) is subjected to a heating treatment, wherein the heating temperature is 600-950 DEG C and a treatment time is 0.3-4h, and the flow rate of the water vapor and/or carbon dioxide is 50-500NL/kg.hr. The catalyst is suitable to be used in hydrocarbon oil hydrotreatment for preparing clean oil products.