The invention discloses a niacin method for preparing an aromatic nitrocompound of alkali sulfide. A reduction liquid is prepared as follows: niacin powder is dissolved in a sodium chloride solution with the concentration being 15%-45% in mass percentage at the temperature of 160-200 DEG C for later use, and the amount-of-substance ratio of the niacin powder to sodium chloride is (0.8-2):1. The niacin method for preparing the aromatic nitrocompound of alkali sulfide is provided, and the aromatic nitrocompound of alkali sulfide is prepared with the niacin method and can replace high-pollution and high-energy-consumption alkali sulfide almost in all niacin powder application fields.