To provide an operation method for a waste melting furnace wherein an auxiliary fuel is supplied to a waste melting furnace to stabilize quantity of heat (latent heat) of waste gas in the waste melting furnace and hence achieve stable operation.

There is provided an operation method for a waste melting such that in a waste melting processing method where waste is thermally decomposed and melted, quantity of heat of exhaust gas in a waste melting furnace is detected, and a supply amount of an auxiliary fuel supplied through an auxiliary fuel supply hole 15 or an air fan blade hole provided on a combustion portion of a furnace bottom of the melting furnace is adjusted on the basis of the aforesaid detected the quantity of heat.