The invention provides device and method for adding a slitter mark. The device comprises a detecting unit for detecting whether a layout to be added with the slitter mark has at least one page without being added with the slitter mark in real time, and a slitter mark adding unit for respectively adding the slitter mark with the preset format into the slitting area of each of the at least one page when the detecting unit detects that the layout has at least one page without being added with the slitter mark. According to the technical scheme, the device and method have the advantages that the slitter mark can be automatically added for the page in the layout, instead of manual adding, and therefore, the automation of the adding of the slitter mark is achieved, the slitter mark adding efficiency is increased, and the workload of operators can be decreased.