The invention relates to a light-emitting diode lens and a lighting device, wherein the shape of the lens is a partially hollow cylindrical body which is cut off along the direction which is parallel to a central axis of the cylindrical body, and a corresponding section of the partially hollow cylindrical body forms an interface of a lens region and a non-lens region of the lens; and the center of a light source is positioned in the center of the section of the partially hollow cylindrical body. The lighting device comprises a lens group formed by a plurality of lenses, wherein the lenses are parallel to the central axis of the cylindrical body, the interfaces between the lens regions and the non-lens regions are overlapped mutually, and the lighting surfaces of the lens are positioned on the same side. The invention adopts the optical lens to directionally change the light intensity distribution, improves the brightness uniformity and the color uniformity of light-emitting diodes and the light source conversion ratio to the largest extent, and reduces the light source glare.