The invention provides a three-eyeglass typed camera lens which is used for a BFL image reading device with short rear focus length; in the same optical axis and at the object side, the camera lens sequentially comprises a dual-convex surface typed first lens part with positive dioptre, a dual-concave surface typed second lens part with negative dioptre, and a crescent-shaped third lens part with positive dioptre; the camera lens meets the optical conditions as follows: BFL/EFL is less than 0.7 and the like, wherein, the BFL is the rear focus length and the EFL is the effective focus length; furthermore, at least an optical surface out of the second lens or the third lens is a non-spherical surface; therefore, the volume of a scanner is effectively reduced and the same imaging clearness is maintained so as to form the camera lens which can compensate various phase differences and has low processing cost and is easy to be processed, so as to be applied to the image reading devices such as scanner and the like.