To provide a machine for crushing and drying general waste containing garbage, whose throughput can be enhanced and in which the depositions stuck to the inner wall of a crushing chamber can be removed automatically, the temperature rising of the inside of the crushing chamber and the ignition of the treating waste can be prevented and the treating waste can be sterilized satisfactorily.

This machine 14 for crushing and drying the garbage-containing general waste by rotating an impacting member 15c in the cylindrical crushing chamber 15a of an impact crusher 15 while hot air is supplied from a hot air supplying means 16 to the crusher 15 through a hot air supplying port 16a is provided with a steam generating means 36 for generating steam, a plurality of nozzles 31 arranged on the peripheral surface of the chamber 15a in the upper part of the port 16a for spraying the steam generated by the means 36 toward the inner wall of the chamber 15a and controlling means 35, 39 for controlling so that the steam generated by the means 36 is sprayed intermittently from each of the nozzles 31 during the operation of the crusher 15.