Aperture adjusting device, camera module and mobile terminal

The utility model provides an aperture adjusting device, a camera module and a mobile terminal. The aperture adjusting device comprises a cover plate assembly and a base assembly, the cover plate assembly is arranged on the base assembly in a covering mode, the cover plate assembly and the base assembly form a containing space, and the aperture adjusting device further comprises a rotating support which is arranged in the containing space and rotatably arranged in the containing space; the driving magnet is arranged on the circumferential side wall of the rotating support, and the driving magnet is formed by combining at least two single-pole magnetic strips or is directly formed by a multi-stage magnet which is integrally formed; the number of the driving coils is at least one, and all the driving coils are arranged on the circumferential side wall of the base assembly corresponding to the driving magnets; the first magnetic piece is arranged on the cover plate assembly corresponding to the driving magnet; t