The invention relates to a switching system for supplying power to an emergency power supply. The switching system comprises a switching system, wherein interior of the switching system comprises an ATS automatic changeover switch, a controller module, a current detection chip, a main power supply and an emergency power supply, wherein the ATS automatic changeover switch is used for switching selection between connection circuits, the controller module is connected with the ATS automatic changeover switch and is used for controlling switching operation of the ATS automatic changeover switch, the current detection chip is connected with the controller module and is used for detecting current intensity in the circuit, the main power supply is connected with the current detection chip and isused for providing electric energy, and the emergency power supply is connected with the current detection chip and is used for providing electric energy for the main power supply when power is in failure. In the switching system for supplying power to the emergency power supply, automatic switching between the main power supply and the emergency power supply is performed, power supply is timely ensured, equipment damage and personal safety are prevented, switching is performed when electric quantity between the main power supply and the emergency power supply is relatively low, protection isachieved between the main power supply and the emergency power supply, loss generated on the power supplies when the electric quantity is excessively low is prevented, and the application safety of the circuit and the power supplies is protected.