The invention discloses a double-ball air-bearing shafting structure, which comprises a supporting body and hemispheres located at both sides of the supporting body, wherein concave arc parts corresponding to the hemispheres are formed at both sides of the supporting body, and the hemispheres are seated in the concave arc parts; The supporting body is provided with through holes penetrating through concave arc parts on both sides, and the traction rod passes through the through holes, and both ends of the traction rod are respectively connected with hemispheres; The support body is provided with a conductive air inlet and an air outlet, and the air outlets are distributed in the concave arc part; When the gas inlet is full of gas, the gas outlet leads out the gas, forming a gas film between the concave arc and the hemisphere. In the double-ball air-bearing shafting structure of the invention, the hemispheres on both sides of the supporting body are suspended in the concave arc part of the supporting body through air films, and are not in contact with the supporting body, so that the transmission can be completely realized according to the design purpose, and the transmission accuracy is extremely high. Your picture is an English translation of these contents.