Poly Aluminized Iron Chloride (PAFC) is an inorganic polymer coagulant formed by coagulation and hydrolysis of aluminum salt and iron salt. According to the principle of synergy, it is a new high-efficiency coagulant prepared by adding iron ion or ferric oxide and other iron containing compounds. It integrates the respective advantages of aluminum salt and iron salt, significantly improves the morphology of aluminum ion and iron ion, and greatly improves the degree of polymerization. Aluminum and iron coagulants are respectively beneficial to air flotation operation to improve the coagulation performance of polyaluminium chloride; The purification effect of high turbidity water and low temperature and low turbidity water is particularly obvious, and alkaline additives or other coagulant aids can not be added.