The machine adopts electrical synchtonous control technique, both welding time and cent-control technique, both welding time and cent-control welding is composed of digital and integrated electric circuit. This operation is accurate, it has stable function, firm welded point and without welded tracks. Not only welding speed is fast but also it is easy to learn and operate. Step motor controls fallen wefts structure and drawing materials are automatic, so it is even and accurate the edge of mesh is regular, it is unnecessary to slice the side. Drawing mesh adopts the device with the elastic thesion link and fixing mesh, it is easy to regulate mesh hole and mesh size is rather accurate, welding aperture could also adjust randomly within the range.