Material mechanical property true triaxial loading test device and test method

The invention relates to a true triaxial loading test device and a true triaxial loading test method for mechanical properties of a material, and belongs to the field of precise scientific instruments. The two precise rotating modules are oppositely fixed on the upper surface and the lower surface in the positioning and supporting module through the posture adjusting tables respectively, the in-situ loading and testing module is fixed on the precise rotating modules, and a clamp of the in-situ loading and testing module is used for fixing a sample. The in-situ loading test device has the advantages that the structure is novel, the in-situ loading test module can perform single-axis, double-axis and three-axis static and dynamic stretching and compression loading on a sample, the in-situ loading test module can be integrated and combined with various imaging devices for use, and the relative positions of the two imaging devices of the imaging module can be accurately regulated and controlled; the precise rotat