An optical imaging lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, and a fourth lens element with negative refractive power. The third lens element includes a convex image-side surface. The fourth lens element includes a concave image-side surface, and at least one of two surfaces of the fourth lens element is aspheric. Additionally, the optical imaging lens assembly also includes an aperture stop and an image sensor disposed at an image plane. By adjusting the relationship among the above-mentioned lens elements, the aperture stop, the image sensor and the image plane, the optical imaging lens assembly can effectively reduce the total optical length and correct the aberration as well as the chromatism to obtain superior imaging quality.