Method for extracting metal from waste hydrogenation catalyst

The invention discloses a method for extracting metals in a waste hydrogenation catalyst, which comprises the following steps: mixing the waste hydrogenation catalyst with a leaching agent, and leaching to obtain a leaching solution; the leaching agent is composed of a first acidic component, a second acidic component and water; the first acidic component is at least one of sulfuric acid or hydrogen chloride; the second acidic component is nitric acid; the mass concentration of the first acidic component in the leaching agent is 60 g/L or above; the mass concentration of the second acidic component in the leaching agent is 100 g/L or above; the waste hydrogenation catalyst contains a nickel element, a tungsten element and a molybdenum element. According to the method, the mixed solution of the sulfuric acid and the nitric acid is used as the leaching agent and the oxidizing agent, oxidation leaching of the waste catalyst is completed, pyrogenic roasting treatment is not needed, and therefore full-wet-process