A mobile device with variable aperture function includes two driving members, which deformation and retraction can be controlled to cause movement of a light hole of a movable aperture sheet towards a camera lens, where the amount of light entering into the camera lens is determined by the light hole of the movable aperture sheet and when the light hole in the movable aperture sheet moves away from the camera lens, the amount of light entering into the camera lens is determined by the camera lens itself, thereby varying the amount of light entering into the camera lens and eliminating the fixed amount of light due to the fixed aperture of the prior art mobile device and permitting miniaturization of the present mobile device.