Dephosphorization method of phosphorus-containing waste water

The invention relates to a dephosphorization method of phosphorus-containing waste water. The invention provides a dephosphorization method of the phosphorus-containing waste water, which can remove inorganic phosphorus and organic phosphorus and has low cost of equipment and raw materials. The invention adopts bleaching liquor or bleaching powder to remove total phosphorus; free chlorine released by the bleaching liquor or the bleaching powder combines with phosphorus atoms to cause organic phosphine to be converted into phosphate radical or hypophosphite; calcium ions in the bleaching liquor or the bleaching powder react with the phosphate radical or the hypophosphite to generate sediment and then are removed; and the inorganic phosphorus and the organic phosphorus are removed together. The method of the invention has simple equipment, small investment, greatly reduces the cost investment of treatment facilities, has low cost and easy acquisition for the bleaching liquor or the bleaching powder, and is easy to be popularized and used; in addition, the sediment taking calcium phosphate as the main component can be used as the raw material for producing phosphatic fertilizers in phosphate fertilizer plants.