A touch display panel and a display device are provided. The touch display panel includes a first substrate and a second substrate disposed opposite to each other; a black matrix; and a plurality of light sensing elements, a plurality of scan lines and a plurality of signal lines formed on the second substrate; the black matrix is formed on the first substrate and only transmits light within the first wavelength range; the light sensing elements are shaded by the black matrix; each scan line is connected to a first end of the corresponding light sensing element, and each signal line is connected to a second end of the corresponding light sensing element; and the light sensing element is configured to generate a touch signal according to the received light within the first wavelength range and the scanning signal provided by the scan line and supply the touch signal to the corresponding signal line. The touch display panel has a simple structure and a relatively low cost.