The invention relates to a melting treatment method for waste incineration flying ash, and belongs to the technical field of environmental engineering. The treatment method comprises the following steps of carrying out pretreatment on the waste incineration flying ash to form treated flying ash; uniformly mixing the treated flying ash with sludge to form a mixture of the flying ash and the sludge; carrying out solidification and stabilization on the mixture of the flying ash and the sludge to form a solidified body; and carrying out melting treatment on the solidified body. The treatment method can effectively solve the problems that the caloric value in the flying ash is relatively low, and heavy metals in the flying ash are liable to volatilize, so that pipeline blockage in a flying ash conveying process is avoided; and the melting treatment method is good in treatment effect, is low in cost, is free from secondary pollution, and is high in resource utilization.