To provide a treatment method of dehydration sludge and ash, and a device for the same for improving a slag ratio of ash by reducing the rescattering of the ash in a furnace, reducing an ash discharging amount in facilities, and impairing the adherability of the sludge to reduce the labor hour in maintenance.

In the treatment of the dehydration sludge and ash by charging the dehydration sludge and the ash discharged from a waste gas processing system of the waste fusing processing equipment, into a waste fusing furnace to fuse them, the dehydration sludge cut out from a sludge storage vessel 10 and the ash cut out from an ash storage vessel 12 are kneaded by a kneader 14, and then the mixture of the kneaded dehydration sludge and ash is supplied to the waste fusing furnace.