The invention discloses an air energy dryer based on an internet-of-things system. The air energy dryer comprises a dryer body. A roller is installed in the dryer body and internally provided with a humidity detecting device. A roller shell is installed on the outer side of the roller. A door body is formed in the front side of the roller. A handle is installed on one side of the door body. A motor, an automatic power-off device, a central processing unit and an internal power supply are arranged at the lower end in the dryer body. A cell phone information module is installed on the central processing unit. The air energy dryer based on the internet-of-things system can be conveniently used by people in different places; through a humidity detecting device, when it is detected that the humidity of clothes to be dried in the roller reaches the standard, the whole dryer is powered off through the automatic power-off device, resource waste is avoided, messages sent by a user through a cell phone can be received through the cell phone information module and the central processing unit, processing is conducted through the central processing unit, and the dryer is made to automatically work.