A portable electronic device includes a main body defining a receiving cavity therein, a camera module received in the receiving cavity, and a movable moveable lens. The camera module includes a casing and a wide-angle lens unit received in the casing. The movable lens is received in the receiving cavity and spaced a distance from the camera module. The movable lens is movable between a first position where the wide-angle lens unit is covered by and optically aligned with the movable lens, thereby the movable lens and the wide-angle lens unit cooperatively constituting a telephoto lens, and a second position where the wide-angle lens unit is misaligned with the movable lens and exposed to an exterior.