The invention discloses an efficient dephosphorization agent for waste water treatment. The efficient dephosphorization agent is prepared from the following components in percentage by weight: 20 to 30 percent of aluminum sulfate, 20 to 30 percent of ferric sulfate, 10 to 20 percent of sodium hypochlorite and 30 to 40 percent of water. The efficient dephosphorization agent belongs to energy-saving, qualified, efficient and environment-friendly water treatment medicament; and the dephosphorization effect of the efficient dephosphorization agent is more than three times that of the conventionalwater treatment chemical, so the efficient dephosphorization agent can meet the marketing requirement.