The application discloses a phosphorus-containing sewage treatment method. The phosphorus-containing sewage treatment method comprises the following steps: (1) preparing raw materials; (2) diluting the raw materials; (3) adjusting the pH of sewage; (4) reacting; (5) flocculating; (6) discharging; (7) recycling. According to the phosphorus-containing sewage treatment method disclosed by the invention, the plurality of types of raw materials are simply mixed; after a mixed solution is diluted, the mixed solution is added into sewage, so that sewage treatment requirements are met and flocculates can also be recycled.