An electronic device with a portable optical module (100) is provided. The electronic device includes a main body (10) having a camera module (20) incorporated therein, an optical element (40), a holder (50) and a magnetic assembly (30). The optical element can be an optical filter. The holder is annular-shaped and defines a through hole therein for accommodating the optical element therein. The magnetic assembly includes a first part coupled to the holder and a second part coupled to the camera module. The first part is configured for magnetic attachment to the second part, thus removably coupling the holder with the optical element to the camera module.