The invention discloses a direct alloying method of vanadium in an electroslag remelting process, and belongs to the technical field of electroslag remelting. The characteristic that the temperature in a furnace is higher in the electroslag remelting process is used by the method, direct reduction and oxidation are conducted on the vanadium by using carbon replacing aluminum, an injection feeding technology is combined tactfully, the adding amount of alloying elements can be controlled accurately, and impurities are reduced. The method includes the steps that firstly, an alloy wire is formed by aluminum oxide and graphite, secondly, the electroslag furnace is started to conduct the electroslag remelting, the alloy wire is fed subsequently, diffusible desoxydation is conducted by adding aluminum particles, after the electroslag remelting process is completed, injection feeding is stopped, and a feeding stage is started until the feeding is completed. By means of the method, the yielding rate of the vanadium is greatly improved, a slag system used in the electroslag remelting process can be prevented from being polluted, the phenomenon that consumable electrodes are scrapped due to the fact that the vanadium content of the consumable electrodes oversteps, and the raw material resource is saved.