This present invention discloses a dynamic zoom lens for multiple-in-one optical system, comprising: a moving member; a wide-angle lens capturing large range image; a first light sensing element converting the large range image into first image signal; a telephoto lens capturing partial image; a second light sensing element converting partial image into second image signal; an image processing module, comprising: an instant local searching unit electrically connected to the moving member; an image integration unit forming composite image; and a display module presenting composite image, and auser interface controlling the instant local searching unit to drive the moving member to perform an instantaneous local search.