Phosphorus removal agent (SP-1) is specifically developed for high phosphorus containing wastewater such as anodizing, chemical polishing and cleaning, pre-treatment before coating, phosphating, electroplating, and chemical plating. It solves the problem of excessive use of other phosphorus removal agents and incomplete phosphorus removal. At the same time, optimizing the formula can also adjust the pH value of wastewater, improve coagulation effect, and reduce treatment costs.