The invention discloses a sensing device which is controlled by a control chip. The sensing device includes: a protection cover module; a circuit board arranged on one side of the protection cover module, wherein the circuit board has a first surface and a second surface, the second surface is positioned on one side facing the protection cover module, of the circuit board, and the first surface is positioned on a side opposite to the protection cover module, of the circuit board; a first electrode structure arranged on the first surface of the circuit board and is electrically connected to a control chip; a socket module which has a conductor structure and is electrically connected to the control chip; and a spacer which is arranged between the socket module and the first surface of the circuit board, is used for generating deformation while the protection cover module is pressed so as to change a distance between the first electrode structure and the conductor structure and allow the control chip to sense change in capacitance between the first electrode structure and the conductor structure. The sensing device can overcome missing of a physical key and a touch virtual key.