The invention discloses a uniform addition mode of elemental sulfur in ammonium phosphate. The uniform addition mode is characterized in that the elemental sulfur contained in ammonium sulphate phosphate contained in a final product is uniformly distributed in solid ammonium phosphate. The addition state of the elemental sulfur in the ammonium phosphate is a solid state or a liquid state. The uniform addition mode of solid sulfur comprises the following steps: mixing a sulfur solid with a nonionic surface active agent and water to prepare a uniform sulfur suspension liquid or a sulfur colloid, and then adding the sulfur suspension liquid or the sulfur colloid to raw material phosphoric acid or reaction slurry obtained after the phosphoric acid is neutralized by using ammonia. The uniform addition mode of the liquid sulfur comprises the following steps: mixing the liquid sulfur with the nonionic surface active agent, and then adding to the raw material phosphoric acid or the reaction slurry obtained after the phosphoric acid is neutralized by using the ammonia, or firstly adding the nonionic surface active agent and then adding the liquid sulfur to the raw material phosphoric acid or the reaction slurry obtained after the phosphoric acid is neutralized by using the ammonia.