The embodiment of the invention provides a touch-sensitive element and a touch display device. The touch-sensitive element comprises a plurality of touch-sensitive units, wherein each touch-sensitive unit comprises a plurality of first touch-sensitive subunits which at least can receive driving signals; each first touch-sensitive subunit comprises an electrode block array; and in the electrode block array of each first touch-sensitive subunit, any two adjacent electrode blocks are mutually connected in a line direction or row direction. The touch-sensitive element can be applied to the display device to realize touch control. Compared with the prior art, the touch-sensitive element omits TPM (Touch Pattern Metal), so that the aperture ratio of the pixel of the display device is improved so as to be favorable for improving the image quality and the visual effect of the display device, meanwhile, the manufacture technology of the TPM is omitted, and the cost of a touch panel or the display device can be lowered.