The invention provides a piezoelectric power generation device and a manufacturing method and a displaying device thereof and belongs to the field of display technologies. The problems that in an existing piezoelectric power generation device, nanowires can not be wrapped by electric conduction layers evenly, and the electric conduction layer is high in cost and not transparent can be solved. The surfaces of first nanowires are wrapped by carbon nanotube layers, the electric conduction performance of the carbon nanotubes is good, and the piezoelectric power generation device has a high length-diameter ratio and excellent mechanical and electrical properties; the carbon nanotubes are adopted as electric conduction layers and can be evenly wrapped by gaps between the first nanowires and the surfaces of the first nanowires close to a first electrode. The piezoelectric power generation device is suitable for all kinds of display devoices and particularly suitable for a touch display device.