In a method for recovering fly ash comprising a sintering step of burning and removing unburned carbon by firing fly ash raw powder containing unburned carbon, the process of measuring the unburned carbon content with respect to the fly ash raw powder, and the fly ash raw powder A sieve classification process in which fly ash powder, which is a sieve with a reduced unburned carbon content, is obtained by sieve classification, and the size of the sieve used in the sieve classification process is set according to the unburned carbon content of the fly ash raw powder. When the unburned carbon content is high, a sieve having a small eye size is used, and when the unburned carbon content is low, a sieve having a large eye size is used, and fly ash fine powder, which is the sieve powder, is recovered through the firing process. It is characterized by that.
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