A touch display device including a drive chip and a touch display panel is provided. The drive chip includes a first common voltage source and a second common voltage source. The touch display panel includes a plurality of touch electrode including a plurality of rows and columns, wherein the number of columns is odd-numbered. The touch display panel includes a middle column, a first region and a second region. The middle column is interposed between the first region and the second region having the same number of touch electrodes. The touch electrodes in the first region and that in the second region are coupled to the first common voltage source and the second common voltage source respectively. The middle column is divided into a first half and a second half by a reference line. The first half and the second half have the same number of touch electrodes.