A power supply switch system for switching power supply to an electronic device, includes an adaptor, a charger module, a battery electrically connected to the charger module and a switch module. The adaptor outputs a voltage signal. The charger module receives the voltage signal and outputs control signals. The switch module receives the control signals and switches the adaptor and the battery to provide power supply to the electronic device. When the adaptor is powered on, the charger module controls the switch module to turn off a first connection between the battery and the electronic device; the charger module controls the switch module to turn on a second connection between the adaptor and the electronic device; and the adaptor provides the power supply to the electronic device.