The present invention discloses an in-cell touch panel, a manufacturing method thereof and a display device. A plurality of nanowire arrays are added between an array substrate and an opposite substrate, nanowires in each nanowire array extend in a direction perpendicular to the array substrate and the opposite substrate; the newly-added nanowire arrays and s pacers provided between the array substrate and the opposite substrate form piezoelectric sensitive elements. Thus, when cell thickness between the array substrate and the opposite substrate is slightly changed due to pressure on the touch panel by any object, a nanowire array may be slightly deformed by squeeze of a spacer, the deformed nanowire array may release charges to change an electrical signal applied to an electrode wire connected thereto, and a touch point can be positioned by detecting a change in the electrical signal, thus achieving high touch sensitivity.