The invention provides an image capture lens system. The image capture lens system comprises a first lens with negative refraction power, a second lens with positive refraction power, a third lens with positive refraction power, a fourth lens with negative refraction power, and a diaphragm arranged between the first lens and the third lens from an object side to an image side, wherein the surfaceof the image side of the first lens is a concave surface; the surface of the image side of the second lens is a convex surface; at least one of the surfaces of the object side and the image side of the third lens is an aspheric surface; the surfaces of the object side and the image side of the fourth lens are aspheric surfaces; and the number of lenses with the refraction power in the image capture lens system is four, the curvature radius of the surface of the image side of the second lens is R4, the focal length of the whole image capture lens system is f, and a distance between the third lens and the fourth lens on an optical axis is T34, so the coefficients are in accordance with the following expression: R4/f is more than -2.0 and less than -0.2, and (T34/f)*100 is more than 0.5 and less than 20.0. By the arrangement, the total length of the system can be shortened effectively; the system has a characteristic of wide vision angle; and the imaging quality can be improved.