Optical lens and laser radar

The invention provides an optical lens and a laser radar, and relates to the technical field of radars. The optical lens comprises a first lens, a second lens and a third lens which are sequentially arranged from the object side to the image side in the extension direction of the optical axis. Wherein the first lens has positive focal power; the second lens has positive focal power, 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, one of the object side surface and the image side surface of the third lens is a concave surface, and the other one is a concave surface or a plane. The optical total length TTL and the effective focal length f of the optical lens meet the condition that TTL/f is larger than or equal to 0.4 and smaller than or equal to 0.45. The optical lens can have a longer focal length while being miniaturized. The optical lens is also beneficial for reducing distortion and