Intelligent power supply and control method thereof. A power supply for altering an output power by detecting a power requirement of an electronic device and the electronic device having a memory. The power supply comprises a converter, a control device and a switch. The converter is able to convert an input power into the output power applied to the electronic device. The control device is coupled to the converter reads power information concerning the power requirement from the electronic device and accordingly controlling the converter to adjust the output power. The switch coupled both the converter and the control device receives a control signal of the control device and switches an output port of the power supply to the converter to transfer the output power from the converter to the electronic device.