The invention relates to an exterior mirror with a mobile photographic lens, which comprises a shell, a mirror surface, a driving lever, a driven lever, the photographic lens and a power source. The exterior mirror mainly drives the driving lever to rotate around a first end of the driving rod through the power source so as to drive the driven lever to move and make the photographic lens move in a long slot along the guide of a first guide device by means of a second guide device. Therefore, the exterior mirror combines a special actuating structure only by the single photographic lens so as to integrate various sightline assistant functions onto the exterior mirror of a common vehicle. Furthermore, through a position of the long slot is configured on the front section of the shell, the exterior mirror can provide the sightline assistant function in front of the left and the right of a vehicle when a driver drives the vehicle in a driveway switching state and the sightline in right front of the driver is blocked by a large vehicle.