The invention provides a built-in type pneumatic wheel pair rotary disc. The built-in type pneumatic wheel pair rotary disc comprises a rotary disc body, a rotary barrel, a guide wheel mechanism and aguide barrel, wherein the guide barrel sleeves the outer wall of the rotary barrel; the rotary barrel is supported on a fixed ground slot through the guide barrel; the lower end of the rotary arm isequipped with a hooking arm; the lower end of the hooking arm is connected with a lower flange; the upper end of the hooking arm is connected with a sleeve; the upper end of the sleeve is equipped with a knurled nut; the outer side of the hooking arm is equipped with a cylinder barrel; the upper end of the cylinder barrel is inserted into the guide barrel; the lower end of the cylinder barrel extends onto the lower flange; an outer fixed ring is arranged on the outer wall of the guide barrel; the outer fixed ring and the lower flange are connected through a double-ended bolt; the outer side ofthe upper end part of the rotary barrel is equipped with the guide wheel mechanism; the upper end of the rotary barrel is equipped with the rotary disc; and the upper end surface of the rotary disc is equipped with a patterned panel. The built-in type pneumatic wheel pair rotary disc adopts an external guide wheel way, adopts a power source which is wind pressure, is convenient to maintain, is low in fault rate, is continuous in action, is convenient to operate (control), is convenient for a wheel pair with a gear box and a brake disc to pass through; and the rotary disc body is equipped witha maintaining hole, so that the rotary disc is conveniently regulated and maintained.