An in-cell touch panel and a display device are disclosed, in the in-cell touch panel, each of the self-capacitance electrodes includes a plurality of self-capacitance sub-electrodes which are insulated from each other and connecting lines for connecting the self-capacitance sub-electrodes; an orthographic projection on the first substrate of each self-capacitance sub-electrode does not overlap with an orthographic projection on the first substrate of each gate line; and/or an orthographic projection on the first substrate of each self-capacitance sub-electrode does not overlap with an orthographic projection on the first substrate of each data line. Thus, there is almost no overlapping area between the self-capacitance electrodes and the gate lines and/or there is almost no overlapping area between the self-capacitance electrodes and the data lines, thus there is almost no overlapping capacitance.