An electronic device with automatic switching input interfaces and a switching method thereof. The electronic device supports an Advanced Configuration Power Interface (ACPI), and includes a display unit, a storage unit, a memory unit, and an embedded controller. The display unit can be changed to a first position or a second position, and sends a signal to an embedded control unit when the display unit is at different positions. A management program running in the electronic device queries the ACPI and the embedded control unit to check the position and state of the display unit, so as to automatically load and run a corresponding program of a virtual input interface or a physical input interface into the memory unit, and remove the other program from the memory unit at the same time.