The utility model relates to a touch key device with backlight. The touch key device comprises a
touch panel, a
control circuit board, a light-emitting
assembly and a filling layer. And the
touch panel is provided with light-transmitting key symbols. The
control circuit board is arranged on one side of the
touch panel and used for recognizing touch signals on the touch panel. The light-emitting
assembly is arranged on the
control circuit board and protrudes out of the surface of the control circuit board. The filling layer is located on the side, provided with the light-emitting
assembly, of the control circuit board and used for filling the
height difference between the light-emitting assembly and the control circuit board. When the light-emitting component emits light, the light can be transmitted from the light-transmitting key symbols on the touch panel, so that a user can still identify characters in a dark environment. By arranging the filling layer, the
height difference between the light-emitting assembly and the control circuit board can be filled and leveled up through the filling layer. Therefore, the touch
signal of the touch panel can be transmitted to the control circuit board through the filling layer, the touch response is sensitive, and the use experience of the touch key device is improved.