System and method for treating incineration fly ash

The invention discloses a system and a method for treating incineration fly ash. The system for treating incineration fly ash comprises electric arc melting equipment, a heavy metal recovery device and flue gas treatment equipment the electric arc melting device is provided with an inlet and a flue gas outlet which are used for adding mixed materials for incinerating flying ash and metallurgical waste residues, and the flue gas outlet is sequentially connected with the heavy metal recovery device and the flue gas treatment equipment through a flue gas pipeline; and the flue gas treatment equipment is provided with a purification flue gas outlet. According to the method for treating incineration fly ash, chlorine-containing incineration fly ash is used as a chlorinating agent in a chlorination metallurgy process, the chlorination agent and the metallurgical waste residue are fused together, the heavy metal element is transferred into the smoke of the melting furnace in the form of chloride, so that separation