The invention discloses a flying-ash handling system applied to a gasification system. The gasification system comprises a gasification furnace and a dust remover connected with the air outlet of thegasification furnace; the flying-ash handling system comprises a dust remover ash discharge treatment device connected with an ash discharge hole of the dust remover and a controller; a dust remover ash treatment device comprises an ash removing part and an ash discharge part which are sequentially connected with the dust remover and a pressure filling and relieving system connected with a pressure filling and relieving hole of the dust removing part, the ash inlet of the dust removing part is connected with the ash discharging hole of the dust remover through a pipeline, the ash inlet of thedust removing part is connected with the dust discharge hole of the dust removing part through a pipeline, and the dust remover ash treatment device further comprises a pressure detector, a control valve or a valve bank arranged on the pipeline between the dust remover and the dust removing part and a control valve or a valve bank arranged on the pipeline between the dust removing part and the dust discharging part. Dry and wet ash treatment processes are combined, manual operation error is reduced through automatic control, and the flying-ash handling system is convenient in operation, cleanand environment friendly and economical in maintenance and investment.