The lead screw lifting device is driven by a reduction motor (or by replacing the motor with a pneumatic motor), and the torque is input to the lead screw elevator to make the extension end extend forward for thrust and retract for tension. It is installed on the rocker arm tensioner of the mesh part to realize the rotation of the rocker arm, so as to lift and lower the tensioning roller to tension and relax the formed mesh, The operation side and transmission side are linked by the intermediate shaft to realize the synchronous movement of the moving supports on both sides.