The invention relates to a hydrorefining catalyst and a preparation method thereof. The catalyst comprises the following components in percentage by weight: (1) 61 to 88% of porous carrier; (2) 2.5 to 30% of catalyst active metals; (3) 0.1 to 8% of phosphor containing acidic component; (4) 1 to 6% of chelating agent; (5) 3 to 10% of ammonia liquor; and (6) the balance being deionized water. The provided catalyst has the advantages that the dispersion degree of active metals is increased, the catalytic activity is effectively improved; during the catalyst preparation process, the mode and conditions of pre-vulcanization are optimized, the using performance of the catalyst is largely improved, and the mechanical strength of the catalyst is enhanced. The invention also provides a preparation method, which has the advantages of simple technology, short preparation period, and good hydrogenation effect.