A protective shell for an electronic device is adapted to accommodate the electronic device. The electronic device includes a camera lens. The protective shell includes a shell body and a lens device. The shell body is adapted to accommodate the electronic device. The lens device is mounted on the shell body, and includes a plurality of lenses. The lens device is operable to move relative to the shell body such that a selected one of the lenses correspondingly overlaps one side of the camera lens of the electronic device to permit switching among different modes of use, thereby enabling the camera lens to have different functions, such as close-up, filtering, wide-angle, and polarizing functions.