NOVELTY - Solution (A) is prepared by dissolving soluble nickel salts in water, adding a complexing agent such that ammonium ion/divalent nickel ion molar ratio is 5-30, and adding a tungsten salt such that tungsten/nickel atomic ratio is 0.1-10. Sodium borohydride or potassium borohydride reducing agent solution is used as solution (B). Solutions (A,B) are mixed and vigorously stirred, and an inducer is added. The formed black precipitate is washed with water and alcohol, and vacuum-dried at 40-120 degrees C and 0.05-0.1 MPa to obtain a hydrodeoxygenation catalyst.    USE - Preparation of catalyst used for hydrodeoxygenation of bio-oil.    ADVANTAGE - The method enables simple preparation of catalyst which efficiently deoxidizes (high catalytic activity) phenols, ketones, aldehydes and alcohols contained in bio-oil at low temperature, under mild reaction conditions without using a shielding gas. Utilization rate of reducing agent is improved, coverage of boron oxide on the surface of active sites of the catalyst is reduced, and the number of active sites on the catalyst surface is increased. The catalyst effectively reduces the content of aromatic hydrocarbon of benzene in the reaction product.    DETAILED DESCRIPTION - Solution (A) is prepared by dissolving soluble nickel salts in water, adding a complexing agent such that ammonium ion/divalent nickel ion molar ratio is 5-30, and adding a tungsten salt such that tungsten/nickel atomic ratio is 0.1-10. Sodium borohydride or potassium borohydride reducing agent solution with a concentration of 0.2-10 mol/mL is used as solution (B). At -10 degrees C to 80 degrees C, solutions (A,B) are mixed and vigorously stirred, and 0.001-2 mol/mL inducer is added. The formed black precipitate is washed with water and alcohol, and vacuum-dried at 40-120 degrees C and 0.05-0.1 MPa to obtain a hydrodeoxygenation catalyst containing nickel, tungsten, boron and oxygen in the bulk phase. The soluble nickel salt is nickel sulfate, nickel chloride, nickel nitrate, or nickel acetate, preferably nickel nitrate or nickel acetate. The complexing agent is aqueous ammonia or organic amine, preferably aqueous ammonia or ethylenediamine. The ammonium ion/divalent nickel ion molar ratio is preferably 10-20. The tungsten salt is tungsten hexachloride, ammonium metatungstate, or sodium metatungstate, preferably sodium metatungstate. The inducer is divalent lead or monovalent silver solution. The concentration of reducing agent solution is preferably 0.5-2 mol/mL. The molar ratio of reducing agent with respect to total content of nickel and tungsten salts is 0.01-10, preferably 0.3-5. The catalyst preparation temperature is preferably -5 degrees C to 30 degrees C.