An ultra-high speed turbine generator, comprising a turbine machine (1), a cooling fan (2), a motor (3), two radial bearings (4a, 4b) and a thrust bearing (5), the radial bearings (4a, 4b) being groove-type dynamic pressure gas radial bearings, the thrust bearing (5) being a mixed-type dynamic pressure gas thrust bearing, a rotor (31) being sleeved at a central portion of an inner shaft (33), the two radial bearings (4a, 4b) being respectively sleeved on an outer shaft (34) located at left and right ends of the rotor (31), the thrust bearing (5) being sleeved on the outer shaft (34) at the right end, and being located on an outer end side of the right end radial bearing (4b), the turbine machine (1) and the cooling fan (2) being respectively arranged at two ends of the inner shaft (33). The present structure implements an ultra-high speed stable operation in an air state, and with regard to identical power requirements, enables the size of the turbine generator to be significantly reduced for miniaturisation.
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