The film doubling and engraving mechanism includes a working platform and a sliding device. A scribing knife is provided on the sliding device. The sliding device is a four-axis linkage structure. The four-axis linkage structure includes an X-axis moving component, a Y-axis moving component, a Z-axis moving component and an angle Turning to the assembly, the bottom of the carving knife is an angled half-blade. The blade of the half-blade is downward, and three composite cutting surfaces are formed upward along the edge of the blade. The three composite cutting surfaces are respectively located on the three outer surfaces of the half-blade. It can move in the X-axis, Y-axis and Z-axis directions respectively. At the same time, the angle steering assembly can drive the carving knife to rotate. During the steering process, the angle steering assembly can rotate the direction of the carving knife's blade according to the program and always keep the blade pointing. The direction of X-axis and Y-axis interpolation movement ensures that the carved wire grooves are delicate line segments drawn by the blade.