To provide a disposal method and device for combustible waste capable of continuously carrying out safe operation without any trouble in operation, and preventing accumulation of combustion residues in the bottom of a combustion space, when carrying out combustion disposal of combustible waste such as waste plastic in a cement manufacturing device.

A midway part of a calcination furnace secondary air duct is modified into a vortex shaped high temperature space, a swirl air flow is generated in a calcination furnace, and combustible waste is inputted from an upper part to carry out combustion. It is a structure capable of preventing adhesion of unburned materials to an inner wall of a vortex chamber, and the bottom is adjacent to the calcination furnace so as to prevent accumulation of combustion residues of the combustible waste in the bottom of the vortex chamber.

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