The four-axis linkage system is mainly composed of XY galvanometers, XY motion platform, platform driver, GMC control card and general marking software. It has the function of unlimited field of vision, synchronize the linear servo shaft and laser scanning galvanometer. When the high dynamic performance of the scanning galvanometer is combined with the large stroke range of the servo platform, a larger working range can be continuously processed than that of the traditional galvanometer, without the need for stitching the working area. The four-axis linkage system not only expands the working range of the laser processing system and the application range of a single optical device, but also avoids the interaction between the laser beam range and the available working range, and improves the processing quality and the production of large parts.