The invention provides a steelmaking method of microalloy steel with added vanadium nitride alloy in the steel, and the method is characterized in that during steel making, when molten steel poured into a ladle accounts for 20-40% of the steel tapping amount, a packaging block of a vanadium nitride alloy additive which is specially sealed and packaged is thrown into the ladle, and residual moltensteel is poured into the ladle; the vanadium nitride alloy additive is a mixture of vanadium nitride alloy powder and 0-10% of aluminium powder or aluminium particles, and is sealed and packaged intoa packaging block by a packaging bag; the packaging bag comprises an outer layer of paper-based packing paper with sufficient strength, and a lining of a single-layer or double-layer airproof plasticfilm; the vanadium nitride alloy powder is directly prepared by the following steps: mixing vanadium compound powder and carbon powder to obtain a mixed powder raw material, adding the powder raw material into a preparation furnace, introducing ammonia gas or nitrogen into the preparation furnace, and allowing the raw material to perform pre-reduction, carbonization and nitridation reactions. Compared with existing steelmaking methods of microalloy steel, the invention can effectively increase recovery rates of vanadium and nitrogen, and improve steel quality.