The invention discloses a control method of a clothes drying device. The clothes drying device comprises a control device, a heating device for heating drying air, a condensing device and an inner barrel driven by a motor. The control method is as follows: the control device selects and starts an energy-saving drying procedure, wherein the energy-saving drying procedure comprises a main drying stage and a subsequent afterheat drying stage; during the main drying stage, both the heating and the condensing device work; during the afterheat drying stage, both the heating device and the condensing device do not work, so that high-temperature afterheat stored in the clothes drying device after the main drying stage can be fully utilized for continuing to dry to-be-dried clothes in the inner barrel, meanwhile the high-temperature afterheat in the clothes drying device is not required to be forcibly discharged out of the clothes drying device by virtue of a cooling stage any more, and the purposes of saving energy and saving water can be achieved. Furthermore, the invention further relates to a clothes drying device operating according to the control method.