An in-cell touch display panel, a manufacturing method thereof, and a display device. The in-cell touch display panel includes a base substrate, a touch electrode, and a touch driver chip. The touch electrode includes a plurality of sub-electrodes that are independent from each other. The display panel further includes a plurality of touch leads that are in one-to-one correspondence with the sub-electrodes. Each of the sub-electrodes is connected to the touch driver chip through a corresponding touch lead. At least one sub-electrode has at least one non-conductive region, and an orthographic projection of the non-conductive region of the sub-electrode and that of the touch lead corresponding to the sub-electrode on the base substrate at least partially overlap.