The wide-angle imaging lens module includes four lenses arranged from an object side to an image side in a sequence of: the first lens, having a positive refractive power, a convex surface on the object side and at least one aspheric surface; a diaphragm; the second lens, having a positive refractive power, a concave surface on the object side and at least one aspheric surface; the third lens, having a positive refractive power, a concave surface on the object side and at least one aspheric surface; the fourth lens, having a negative refractive power, a convex surface on the object side and at least one aspheric surface. The first and the second lenses perform a symmetry concave, providing the wider field of view angle and the larger aperture. A structural design that allows lenses to restrain better aberrations performances of aspheric surfaces further provides high-definition and high imaging qualities.