An optical lens, comprising: a front lens group , configured to diverge incident light rays; and a rear lens group , configured to converge the divergent incident light rays, the material of the front lens group being plastic and the material of the rear lens group being plastic or glass; wherein the front lens group comprises a first lens and a second lens ; the rear lens group comprises a third lens , a fourth lens , a fifth lens and a sixth lens ; and the first lens , the second lens , the third lens , the fourth lens , the fifth lens and the sixth lens are sequentially arranged from an object side to an image side, the material of the first lens , the second lens , the third lens , the fourth lens and the sixth lens being plastic and the material of the fifth lens being plastic or glass; characterized in that the first lens has a meniscus shape convex toward the object side, a first surface and a second surface of the first lens being both aspheric surfaces; the second lens has a cylindrical biconvex shape, a first surface and a second surface of the second lens being both aspheric surfaces; the third lens has a biconvex shape, a first surface and a second surface of the third lens being both aspheric surfaces; the fourth lens has a biconcave shape, a first surface and a second surface of the fourth lens being both aspheric surfaces; the fifth lens has a biconvex shape, a first surface and a second surface of the fifth lens being both spherical surfaces; and the sixth lens has a concave-plane shape, a first surface of the sixth lens being an aspheric surface and a second surface of the sixth lens being a planar surface. a front lens group , configured to diverge incident light rays; and a rear lens group , configured to converge the divergent incident light rays, the material of the front lens group being plastic and the material of the rear lens group being plastic or glass; wherein the front lens group comprises a first lens and a second lens ; the rear lens group comprises a third lens , a fourth lens , a fifth lens and a sixth lens ; and the first lens , the second lens , the third lens , the fourth lens , the fifth lens and the sixth lens are sequentially arranged from an object side to an image side, the material of the first lens , the second lens , the third lens , the fourth lens and the sixth lens being plastic and the material of the fifth lens being plastic or glass; characterized in that the first lens has a meniscus shape convex toward the object side, a first surface and a second surface of the first lens being both aspheric surfaces; the second lens has a cylindrical biconvex shape, a first surface and a second surface of the second lens being both aspheric surfaces; the third lens has a biconvex shape, a first surface and a second surface of the third lens being both aspheric surfaces; the fourth lens has a biconcave shape, a first surface and a second surface of the fourth lens being both aspheric surfaces; the fifth lens has a biconvex shape, a first surface and a second surface of the fifth lens being both spherical surfaces; and the sixth lens has a concave-plane shape, a first surface of the sixth lens being an aspheric surface and a second surface of the sixth lens being a planar surface. <EOS>