The utility model discloses a heat radiator. The heat radiator is used for heat radiation of devices in need of heat radiation. The heat radiator comprises an acquisition circuit, a fan, a switch circuit, a control circuit, a main body, and a slideway, wherein the main body is used for bearing a device in need of heat radiation; the slideway is disposed on the surface of the main body; the fan is disposed on the slideway in a slidable manner, and used for heat radiation of the device in need of heat radiation; the acquisition circuit is used for acquiring a temperature signal, and outputs a voltage signal according to the temperature signal; the switch circuit is connected with the fan, and is used for controlling a power supply to supply power or the fan; an input terminal of the control circuit is connected with the acquisition circuit, an output terminal of the control circuit is connected with the switch circuit, and the control circuit is used for controlling the work mode of the switch circuit according to the voltage signal. According to the heat radiator, the control circuit controls the work mode of the switch circuit according to the inputted voltage signal, so as to achieve the object of intelligent heat radiation for the device in need of heat radiation; and the fan can be moved to a position corresponding to the area, which is high in temperature, of the device in need of heat radiation, so that the heat radiation efficiency is improved.