PURPOSE: To provide an economical device by symplifying the structure, and to further propagate it as a pollution preventing device, with regard to a processor for a waste filter after it is used continuously for a dry cleaning machine.

CONSTITUTION: The waste filter purifying device for a dry cleaning machine is constituted so that plural pieces of waste filters 1 are closed up tightly and contained in a pressure tank 5 in a series system, and on the other hand, in a circuit for connecting a hot air intake 51 side and a solvent contained hot air outlet 52 side of the pressure tank 5, a forced fan spot 55, a cooling spot 54 for collecting a solvent, and a heating spot 55 are placed, and the waste filter 1 is purified by evaporating and collecting a residual solvent by hot air fed in to the outside peripheral surface of each waste filter 1.