The invention provides an over-limit anti-counterfeiting method. The over-limit anti-counterfeiting method comprises the steps that superfine short fibers are arranged on a code so that over-limit points/lines are formed, amplified shooting is carried out on the superfine short fibers so that a file photo is obtained, and the file photo is saved in an anti-counterfeiting inquiry network system database of a computer; people shoot the superfine short fibers by adopting a camera phone so that a to-be-checked photo is obtained, and then the people compare the distribution characteristics and width of the superfine short fibers on the to-be-checked photo with the distribution characteristics and width of the superfine short fibers on the file photo, so that the authenticity can be distinguished. According to the over-limit anti-counterfeiting method, the production and implementation are simple and feasible, and the authenticity can be distinguished by adopting the mobile phone; the over-limit points/lines formed by the superfine short fibers can not be copied through printing, so that the technical bug that 'a thief from within is hard to guard against' in the current digital anti-counterfeiting field is plugged.