Preparation method of phosphorus removal agent and wastewater treatment method

The invention discloses a preparation method of a phosphorus removal agent and a wastewater treatment method, the preparation method of the phosphorus removal agent comprises the following steps: dissolving carboxymethyl cellulose in a first solution containing ethanol, water and sodium hydroxide to prepare a pretreatment solution; the preparation method comprises the following steps: soaking melamine sponge in a pretreatment solution, then wrapping a soaked sponge sheet with gauze, standing, and then drying to obtain melamine sponge coated with sodium carboxymethyl cellulose; placing the sodium carboxymethyl cellulose coated melamine sponge in a second solution containing ethanol, water and ferric salt, stirring, wrapping with gauze, standing, and drying to obtain a carboxymethyl cellulose coated iron-based melamine sponge crude product; and washing the carboxymethyl cellulose coated iron-based melamine sponge crude product, and then drying to obtain the phosphorus removal agent. The problems that small-part