Optical lens

The invention discloses an optical lens, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power and a fourth lens with negative focal power from an object side to an imaging surface along an optical axis, the second lens has negative focal power; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power; the fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface; the sixth lens has positive focal power; and the seventh lens has negative focal power. The seven lenses are adopted, through specific surface shape setting and reasonable focal power distribution, especially the first lens and the second lens adopt the negative focal power, the optical lens can collect large-range light rays, the field angle of the optical lens is improved, meanwhile, the optical lens has large positive d