A keyboard with a sensing switch function includes a press key module provided for a user to input a keyboard signal, a micro control unit electrically coupled to the press key module for receiving a switching signal to determine the output priority of each output port and deliver the keyboard signal, and plural output ports for transmitting the keyboard signal via a cable or wireless transmission. The keyboard also includes a sensing module with plural light sensors for sensing a change of light to generate a switching signal, and a display module with plural indicating lamps having a quantity equal to the quantity of the output ports, and the indicating lamps are switched according to the output mode. After obtaining the output priority, the output port outputs the keyboard signal to an external device.