This study designed and analyzed a miniaturized iris recognition lens by leveraging on the natural anticounterfeiting feature of the human iris. The lens comprises four even aspheric lenses, with an f-number of 1.8, a full field-of-view angle of 42°, a total length of 2.5 mm for the optical system, and working distance is 184-389 mm. Moreover, in the range of variable working distance, for the iris recognition lens, the modulation transfer function (MTF) values at a half-cutoff frequency for each field of view all exceed 0.4, the optical distortion is lower than 0.6%, and the relative illuminance is greater than 80%. The material of the designed lens is made of optical plastic, which has advantages of small volume, lightweight, low production cost, low f-number, and good imaging quality. Therefore, the designed iris recognition lens can be applied to efficient biometric recognition in small mobile devices, such as smartphones.