Pneumatic motor device with high speed and low speed switching

The utility model discloses a pneumatic motor device with high speed and low speed switching. A first internal gear and a driving gear are orderly, coaxially and hollowly sleeved in a blade pneumatic driving motor spindle, a second internal gear is arranged on an output shaft, the output shaft and the blade pneumatic driving motor spindle are coaxially arranged; the spindle of a cylinder is provided with a first gear clutch engaged with a peripheral gear at the side of the first internal gear, and is further provided with a second gear clutch engaged with a third internal gear, a planet shaft is hollowly sleeved in the third internal gear, both ends of the planet shaft are respectively provided with a first planet gear and a second planet gear, the first planet gear is engaged with the first internal gear, and the second planet gear is engaged with the second internal gear. The pneumatic motor device disclosed by the utility model enables a planet gear speed reducer to switch back and forth between an ordinary gear train and an epicyclic gear train, the smaller the reduction ratio of the ordinary gear train is, the greater the reduction ratio of the epicyclic gear train is; and therefore, the aim of speed switching is achieved.