To provide a method of incinerating organic waste by which an organic waste containing water at a high percentage of content can be incinerated and the heat energy of the produced exhaust gas can be utilized for power generation, heating, etc.

This method of incinerating organic waste is composed of a first step of throwing a wet raw material 2 composed of the water-containing organic waste in a permeability dryer 5, a second step of fermenting and drying the material 2 into a dried raw material 12 in the dryer 5, and a third step of burning the dried raw material 12 by throwing the material 12 in combustion equipment 16. Since the wet raw material 2 is dried by the fermenting and drying method, the exhaust gas which is produced when the dried raw material 12 is burnt becomes high in temperature and can be converted sufficiently into effective energy, such as the electric power, etc.