The embodiment of the present invention discloses a touch display device, including: a common electrode layer, having a plurality of driving regions with driving region electrodes inside, which are arranged in a rectangular array, and a plurality of floating regions with floating region electrodes inside located between the driving regions of tow adjacent columns, and the two adjacent floating regions are located in space and construct a floating region pair, and isolating regions among the driving regions and the floating regions; floating connection lines are distributed at the sensing layer, and one point of a floating connection line is electrically coupled to the floating region electrode in one floating region in the floating region pair with a first via, and an another point of the floating connection line is electrically coupled to the floating region electrode in the other floating region in the floating region pair with a second via.