The invention discloses a high-precision plate and strip rolling process flying gauge change implementation method based on feature point tracking. Division of a weld joint wedge-shaped rolling area in the strip steel continuous rolling process is detailed, that is, the division includes a preliminary weld joint flying gauge change stage, a weld joint area rolling stage and a post weld joint flying gauge change stage. According to different rolling parameter target set values at the different stages, the flying gauge change process of plate and strip rolling is accurately controlled. The method only needs to be implemented conveniently under the software programming condition, and the cost investment is not needed; by means of high-precision control over the flying gauge change process, the control precision of the plate and strip head and tail thickness can be greatly improved, the head and tail out-gauge length is reduced, and the stability of the rolling process is improved; and the method can be widely popularized to the plate and strip rolling factories.