The application discloses a touch display device, including a liquid crystal display panel, a touch electrode, and a backlight module on a light incident side of the liquid crystal display panel. The backlight module includes a metal back plate. The touch display device further includes a shielding electrode on a side of the touch electrodes facing the backlight module, both the shielding electrode and the metal back plate are grounded. The touch electrode and the shielding electrode form a capacitor, and the product of a capacitance value of the capacitor and a resistance value of the shielding electrode is smaller than a pulse width of touch signals applied to the touch electrodes.