A heat system utilizing solar energy is disclosed herein, which includes at least one solar panel, an energy control unit, a temperature control device, at least one heat-radiating element, and at least one storage cell. The solar panel collects solar energy and transforms it into electric current that flows through the energy control unit, the temperature control device, and the heat-radiating element to release heat energy with a predetermined temperature; or the energy control unit directs the electric current to the storage cell for backup. When the solar energy is insufficient, the energy stored in the storage cell can be transformed under the control of the energy control unit into electric current flowing through the temperature control device and the heat-radiating element to release heat energy with a predetermined temperature.