The invention discloses a method for reducing an increased nitrogen amount of high-strength steel in a converter ladle. The method comprises the steps of: controlling the acid-soluble aluminum of themolten steel in the ladle to 50-200 ppm; controlling the temperature of the molten steel entering the ladle to be 1585+/-10 DEG C; alloying manganese with medium carbon ferromanganese and electrolyticmanganese. The method reduces the nitrogen content of the high-strength steel product by controlling the acid molten aluminum content of the ladle, the temperature of the ladle and the use amount ofalloy used for replacing or reducing the high nitrogen content, and the quality of the steel is improved while the increased nitrogen amount of the molten steel in the ladle of the converter process is suppressed. The method can effectively reduce the increased nitrogen amount of the molten steel in the ladle of the high-strength steel of the converter process, from the original 15+/-3ppm to 5+/-2ppm, thereby improving the quality and performance of the finished steel.