The disclosure provides an image identifying method and an image identifying device. The method includes: retrieving a first computer tomographic (CT) image including a plurality of first pixels； retrieving a plurality of second pixels from the first pixels, and generating a second CT image based on the second pixels； performing a contrast enhancement algorithm on the second CT image to adjust a contrast of the second CT image； identifying a first image region in the second CT image to generate a third CT image, wherein the first image region includes a first object； dividing the third CT image into a plurality of sub-images, and only reserving a specific image region corresponding to the first object in each sub-image； combining the sub-images into a fourth CT image； and identifying an object type of the first object based on the fourth CT image.
