The invention discloses a spring cloth-pressing mechanism of a full-automatic edge stitch sewing machine. Double-acting air cylinders are installed at two sides of an air cylinder mounting plate, an air cylinder connecting plate is installed on the cylinder rod ends of the two air cylinders, and the air cylinder connecting plate is arranged under the air cylinder mounting plate. The lower part of the air cylinder connecting plate is provided with a rotary sliding table, the rotary sliding table is connected with a ball spline shaft through a spline, the bottom of the ball spline shaft is provided with a template locking block, a thread sleeve is installed on the central part of the ball spline shaft in a clasping manner, a nut is installed on the exterior of the thread sleeve through a screw thread, and a locking nut is installed on the top of the ball spline shaft. The central part of the ball spline shaft is sleeved by a spring, the lower end face of the spring abuts against the nut, the upper end of the spring abuts against the lower part of the rotary sliding table, a copper sleeve is connected with the rotary sliding table, and the locking nut on the top of the ball spline shaft abuts against the top of the copper sleeve. The spring cloth-pressing mechanism effectively controls the cloth template to go up and down in the Z direction, also controls the cloth to rotate on the X-Y plane, and is high in automation degree, and provides a basis for automation control of the full-automatic edge stitch sewing machine.