To provide a method for the dechlorination treatment of waste plastics capable of effectively conducting the dechlorination treatment of polyvinyl chloride incorporated with large amounts of inorganic compounds such as chlorine-containing plastics, especially waste electric wire covering materials.

The method comprises the following procedure: Plastics including chlorine-containing ones are admixed with a predetermined amount of coke, the resultant mixture is loaded on a quartz tray and put into a treatment chamber with a microwave irradiator, where the mixture is irradiated with microwave to conduct an induction heating treatment.