Plastic waste is increasing more and more with growing production of plastic products. Refuse incinerating plants of cities can not dispose of this growing plastic waste.Therefore we have developed the two types of plastic waste disposal apparatus. One is a small capacity and is a continuous disposal furnace with a gas scrubbing apparatus. The other is a larger capacity and takes of low temperature carbonization before feeding a waste to the the disposal furnace.By this process, we can dispose of plastic waste without generating of poisonous hydrogen chloride gas from polyvinyl chloride.