The invention relates to the field of aluminum intermediate alloy synthesis, and particularly discloses a preparation process for producing an aluminum-vanadium alloy with a molten-salt growth method. The preparation process comprises the steps that an aluminum ingot is added into an electric induction furnace, molten and heated to 700-900 DEG C; sodium fluoroaluminate, potassium fluoroaluminate and vanadium pentoxide are blended into a mixture, and added into a workbin of an automatic feeding machine; the mixture is then added into the electric induction furnace, sampling and testing are conducted after a reaction is conducted for 60-100 minutes, villaumite on the surface of the alloy is poured out when the alloy is qualified, and residual villaumite on the surface of the alloy is cleared away by adding a slag former; and the alloy is heated, argon is introduced through a rotating degasifying machine for refining degasifying, and the slag former is added into the alloy for conducting slag forming again. According to the preparation process for producing the aluminum-vanadium alloy with the molten-salt growth method, the electric induction furnace is utilized, the sodium fluoroaluminate, the potassium fluoroaluminate and the vanadium pentoxide are blended and added into high-temperature molten aluminum, and the aluminum-vanadium alloy is directly produced, so that the problems that when the aluminum-vanadium alloy is prepared with a mix-melting method, the cost is high, the energy consumption is high, the time is long, the efficiency is low and the quality is instable are solved.