A touch display panel, a test method thereof and a display device are provided. The touch display panel includes: a base substrate, a plurality of touch electrodes in an array provided in a touch area of the base substrate, at least four test signal lines in a non-touch area of the base substrate, and a plurality of touch traces of connecting the touch electrodes and corresponding test signal lines. Each touch electrode and peripheral touch electrodes correspond to different test signal lines. The peripheral touch electrodes refer to other touch electrodes adjacent to one touch electrode and arranged along the row direction, the column direction and the diagonal direction.