Manganese-containing wastewater treatment method

The invention discloses a manganese-containing wastewater treatment method which comprises the following steps: pre-oxidizing manganese-containing wastewater, adding a manganese removal agent, and directly removing manganese ions in the manganese-containing wastewater through a coordination reaction-neutralization reaction-flocculation reaction-solid-liquid separation process, the mass ratio of the manganese removal agent to manganese ions in the manganese-containing wastewater is (0.2-1.2): 1; the manganese ions in the wastewater are directly removed. The manganese removal agent is prepared by the following steps: carrying out solid-liquid separation on the manganese-containing acidic wastewater of the mine to obtain a solid phase, drying and crushing sediments washed by clear water, stirring and infiltrating the sediments by using an infiltrating solution containing ferric salt, manganese salt and aluminum salt, adding an oxidation agent, and activating by ultrasonic treatment. After the manganese-containin