The present disclosure provides an image scanning system and an image scanning method. The image scanning method includes: receiving a first image of a first optical device and a second image of a second optical device; determining objects of the first image or the second image; selecting at least one of the objects of the first image or the second image as a region of interest to scan the region of interest continuously by the second optical device so as to obtain depth image information of the region of interest; and integrating the depth image information into the first or second image. Therefore, the present disclosure obtains higher image resolutions, faster scanning speeds and more accurate recognition results.