To provide a crushing treatment apparatus capable of sufficiently washing off the mud or the like adhering to a synthetic resin sheet.

This crushing treatment apparatus is equipped with a crusher 13 for crushing the synthetic resin sheet into fragments and a dry washing machine 14 for peeling the contaminant adhering to the surfaces of the fragments by the impact or friction force given by a high-speed rotator 32. The synthetic resin sheet is washed using this apparatus to as to be capable of being regenerated.