A touch display panel, a testing method therefor and a display device, the touch display panel comprising: a substrate, a plurality of touch electrodes (101) located at a touch area (100) of the substrate and arranged in an array, at least four test signal lines (201) located in a non-touch area (200) of the substrate, and a plurality of touch wiring (102) connecting the touch electrodes (101) and the corresponding test signal lines (201). Each of the touch electrodes (101) and surrounding touch electrodes (101) correspond to different test signal lines (201); and each of the surrounding touch electrodes (101) are the adjacent touch electrodes (101) of a touch electrode along the row direction, the column direction and the diagonal direction.