PURPOSE: To provide a method to easily incinerate distillation residue without making the distillation residue adhering to the inner wall of a distillation tank in reproduction distillation of a waste solvent.

CONSTITUTION: Distillation residue does not adhere to the inner wall of a distillation tank 1 by carrying out distillation under the conditions that a waste solvent 3 is put in a heat-resistant polymer bag 2. Then, on the complition of the distillation, the distillation residue can be taken out as it is put in the heat-resistant polymer bag 2 and thus incineration of the residue, as treatment of the distillation residue, can be carried out easily.