A multi-focal lens for a lighting device includes a central portion and multiple peripheral portions around the central portion. The central portion has a central convex refracting surface, and each peripheral portion has an oblique refracting surface and a convex refracting surface opposite to the oblique refracting surface, wherein the oblique refracting surface extends at an angle with respect to the optical axis of the multi-focal lens. The central portion and the peripheral portions share a common flat surface opposite to the refracting surfaces of the central portion and the peripheral portions. The convex refracting surface and the oblique refracting surface of each peripheral portion can change the paths of corresponding light rays refracted from the flat surface to increase the distance and area of illumination. Furthermore, the volume and thickness of the lens required for a lighting device can be reduced, so that the production cost can be reduced.