Optical lens

The invention discloses an optical lens, which sequentially comprises a first lens with positive focal power from an object side to an imaging surface along an optical axis, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power from the object side to the imaging surface, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has negative focal power; the fourth lens has negative focal power, the object side surface of the fourth lens is a convex surface near the optical axis, and the image side surface of the fourth lens is a concave surface near the optical axis; and the object side surface of the fifth lens is a convex surface in a paraxial position, and the image side surface of the fifth lens is a concave surface in a paraxial position. The optical lens provided by the invention at least has the advantages