An Overhang detection method for a battery electrode sheet includes acquiring an image of a battery electrode sheet; determining the locations of a plurality of electrode sheet edges in the image, wherein the plurality of electrode sheet edges are electrode sheet edges related to an Overhang measurement value corresponding to the image, the location of each electrode sheet edge is determined on the basis of an area where each electrode sheet edge is located, and the area where each electrode sheet edge is located is a dynamically determined area; and determining, according to the locations of the plurality of electrode sheet edges, the Overhang measurement value corresponding to the image.