The invention relates to the field of unmanned aerial vehicles, and provides a video smoothening method, a video smoothening device, the unmanned aerial vehicle and a storage medium. The method comprises the steps of acquiring movement information of the unmanned aerial vehicle collected by an inertial measurement unit and an original video collected by a fish-eye lens; augmenting stability of theoriginal video by using the movement information to acquire the stability augmented video; acquiring a stabilization angle corresponding to the nose of the unmanned aerial vehicle, wherein the stabilization angle is the angle corresponding to the fish-eye lens when the stability augmented video is acquired; when the direction of the nose changes, computing a deviation angle according to the stabilization angle; and when the deviation angle is more than a preset angle, smoothening the stability augmented video by using a PID controller, thus allowing a view angle direction of the stability augmented video to be close to the direction of the nose smoothly. According to the method and the device provided by the embodiment of the invention, the fish-eye lens can rotate continuously and stablywhen the unmanned aerial vehicle turns, so that the shot video is smooth, continuous and clear.