The invention discloses an axial full-floating micro ultra-high-temperature mechanics experiment device. The axial full-floating micro ultra-high-temperature mechanics experiment device comprises a bottom plate (1), a left slide block (2), a right slide block (3), a chuck (4), electrodes (5), a small electrode holder (6), a large electrode holder (7), slide rails (8), press bars (9), a force sensor (10), a force sensor connection block (11), a baffle block (12) and a ceramic gasket (13), wherein a through groove in the middle part of the left end of the bottom plate (1) is used for fixing the force sensor (10); the two pairs of slide rails (8) and press bars (9) are installed between the left slide block (2) and the bottom plate (1); the ceramic gasket (13) is arranged between the chuck (4) and the left slide block (2) to insulate and isolate the left slide block (2) from the chuck (4); the four electrodes (5), the large electrode holder (7) and the small electrode holder (6) are placed in the groove of the chuck (4); the right slide block (3) and the left slide block (2) are in structural symmetry about a slide direction except different parts connected with the sensor; assembly for the right slide block (3) with the bottom plate (1), the slide rails (8), the chuck (4) and the ceramic gasket (13) is completely the same as that for the left slide block (2); the outer end surface of the right slide block (3) is connected with an external drive device; the drive device is coaxial with the force sensor (10).