The invention discloses an imaging lens, an iris imaging module and an iris identification device, and belongs to the field of biological identification. From front to back of a light incidence direction, the imaging lens sequentially comprises: a first lens, wherein the first lens is a double-convex lens with positive power, the front surface is a convex surface, and the back surface is a convex surface; a second lens, wherein the second lens is a double-concave lens with negative power, the front surface is a concave surface, and the back surface is a concave surface; a third lens, wherein the third is a convex-concave lens with positive power, the front surface is a convex surface, and the back surface is a concave surface; a fourth lens, wherein the fourth lens is a double-convex lens with positive power, the front surface is a convex surface, and the back surface is a convex surface; and a fifth lens, wherein the fifth lens is a convex-concave lens with negative power, the front surface is a convex surface, and the back surface is a concave surface. The third lens and the fourth lens are glued together. The imaging lens provided by the invention is good in imaging quality, wide in collection range, convenient to use and simple in structure.