The invention provides a device for testing the micro-torsion mechanical property of a low-dimension material. The device comprises a stander, a force sensor, a micro-torsion sensor, a torsion wire rotation angle measurement component, an upper chuck, a lower chuck, a stepping motor, a three-dimensional translation table, a screw and nut component, a servo controller, an analog-to-digital collection card and a computer system, wherein both ends of a tension wire of the micro-torsion sensor are tensioned and fixed on a bracket and have high rigidity and stability; by replacement of the torsion wire, a measurement range can be adjusted; moreover, the force sensor is arranged at the upper end of the micro-torsion sensor, so that an axial force during torsion test can be detected in real time. In the device, a rotation angle of the torsion wire is measured in a manner of combining a light target and a photoelectric displacement sensor; and compared with a conventional light lever method, the device has a compact structure, high automation degree and high stability. By regulation of the three-dimensional translation table, an upper chucking point and a lower chucking point can be aligned. The computer system can obtain a torque-rotation-angle curve of a test sample in real time. The device is applicable to micro-torsion mechanical property of the low-dimension material.