Ultra-precise air-floating motorized spindle

The utility model discloses an ultra-precise air-floating motorized spindle. A first air-floating bearing is arranged as a radial air-floating bearing and supports the motorized spindle in the radial direction. A second air-floating bearing and a third air-floating bearing support the motorized spindle in the axial direction. The motorized spindle supports optional motorized spindle equipment under the effect of the three air-floating bearings, and the shortcomings that due to the fact that a motorized spindle of a general-purpose machine tool is mainly supported by a bearing machine, mechanical frictional wear is rather serious, the rotation stability of the motorized spindle becomes poor along with increase of machining time and the precision machining accuracy of parts hardly meets the requirement are overcome. The smooth finish of work-pieces to be machined can meet the mirror surface degree without grinding.