PURPOSE: To provide a dry distillation combustion method in which waste materials such as plastics and the like, in particular, items such as FRP dusts or the like hardly combustible can be substantially and completely ignited at their combustible parts.

CONSTITUTION: Waste material is fed into a first chamber 2A, dry distilled and then generated gas is fed into a second chamber 2B where the gas is ignited. Then, the waste material is fed into the second chamber 2B, the generated gas is fed to the first chamber 2A, where the previous dry distilled residue is ignited along with the gas, thereby waste plastics and the like can be substantially and completely ignited.