Production method of vanadium trioxide

The invention relates to a production method of vanadium trioxide, which comprises the following steps: uniformly mixing an ammonium vanadate compound, a reducer and a catalyst in a mass ratio of (60-74):(15-25):(2-4), and standing to obtain a furnace material, wherein the ammonium vanadate compound is ammonium polyvanadate or ammonium metavanadate or ammonium orthovanadate or ammonium pyrovanadate or any combination thereof, the reducer is flake graphite powder or carbon black or powdered charcoal or graphite electrode carbon powder or any combination thereof, and the catalyst is calcium fluoride or calcium oxide or calcium carbonate or any composition thereof; sending the furnace material into a closed roasting furnace in a nitrogen protective atmosphere to carry out closed roasting, wherein the furnace material is sequentially subjected to dewatering, ammonium removal and reduction to obtain a roasting product; and cooling the roasting product, and discharging to obtain the vanadium trioxide with the vanad