Waste incineration fly ash treatment method and system

The invention relates to a waste incineration fly ash treatment method. The method comprises the steps that S1, a molten salt molten pool is established; s2, waste incineration fly ash is added into the molten salt molten pool; and S3, molten waste salt is discharged from the molten salt molten pool, and recycling treatment is conducted on the molten waste salt. Correspondingly, the invention further provides a waste incineration fly ash treatment system. According to the method, the waste incineration fly ash is treated through the fused salt, high-content metal salt in the fly ash is promoted to be rapidly dissolved out through the excellent heat and mass transfer characteristics and reaction characteristics of the fused salt, and resource recycling of the metal salt can be facilitated; dioxin can be effectively decomposed in the high-temperature environment of the molten salt molten pool, and the De novo synthesis reaction of PCDD/Fs is inhibited; and heavy metal substances in the fly ash can be dissolved