An in-cell touch panel, a manufacturing method thereof and a display device are provided. The in-cell touch panel includes a base substrate, and a signal line, a touch electrode and a touch line which are provided on the base substrate, the touch line being electrically connected with the touch electrode, wherein the touch line and the signal line extend along a same direction, and the touch line is at least partially overlapped with the signal line in a direction perpendicular to the base substrate. The in-cell touch panel, the manufacturing method thereof and the display device are configured to solve a problem of low pixel aperture ratio.