The invention discloses a special embroidery box for embroidered cloth. The special embroidery box comprises a front beam, a rear beam, a left beam, a right beam, a supporting beam, five pneumatic devices c, two cylinder connecting rod mechanisms, a pneumatic device a, a pneumatic device b, a rear edge strip and left and right beam cover plates, wherein the front beam, the rear beam, the left beam and the right beam form an embroidery box frame; the supporting beam, the five pneumatic devices c and the two cylinder connecting rod mechanisms are mounted on the front beam and the rear beam; the pneumatic device a, the pneumatic device b, the rear edge strip and the left and right beam cover plates are mounted on the left beam and the right beam; a cylinder a of each of the cylinder connecting rod mechanisms is fixed on the front beam through an angle plate, and a cylinder joint is positioned at the threaded end of a piston rod of the cylinder a; each of the two cylinder connecting rod mechanisms and a fixing plate are mounted on the front beam through a two-eye connecting rod; the two-eye connecting rod is positioned on the left side of a three-eye connecting rod and is connected with a middle hole of the three-eye connecting rod through a pin shaft; one end of the cylinder joint is connected to the threaded end of the piston rod of the cylinder a, and the other end of the cylinder joint is connected with an upper end hole of the two-eye connecting rod through a pin shaft and is positioned on the right side of the three-eye connecting rod; the pneumatic devices are adopted for pressurization; the structure is simple; the automatic clamping and tensioning of the cloth in the embroidery process can be realized, so that the embroidery process becomes very simple and quick.