The invention provides an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens with refracting power in order from a light incidence side to a light-emitting side along an optical axis, and at least one glass lens is included. The first lens has a positive refracting power, the second lens has a positive refracting power, and the third lens has a negative refracting power. The optical lens satisfies a condition of 0.5EFL G G is an effective focal length of the at least one glass lens. The optical lens is adapted for receiving an image beam from the light incidence side, and the image beam forms a stop on the light-emitting side after passing through the optical lens. A display device is also proposed.