The invention discloses a super-gravity true-triaxial rock loading experimental device and method. The device comprises a control center, a ground oil source, a centrifuge, a true-triaxial loading test device and a counterweight block; the true-triaxial loading test device comprises a bottom plate, a three-axis chamber, a three-axis chamber top cover, an axial principal stress loading device, twolateral principal stress loading devices, two transparent reaction force observation devices and an underground cavern surrounding rock sample. According to the super-gravity true-triaxial rock loading experimental device and method of the present invention, a 1/N-times underground cavern surrounding rock model experiment is performed in an N-times supergravity environment, and therefore, the similarity of the model experiment is greatly improved; and the transparent reaction plates are used to directly observe deformations and cracks on the side surface of the sample through an image. Compared with a traditional surface bond strain gauge and displacement sensor single-point measurement method, the method of the invention has the advantages of greatly increased monitoring density, greatlyreduced cost, and greatly reduced coordination difficulty. The circular three-axis chamber is adopted to provide a reaction force, and therefore, the circular three-axis chamber is more reasonable than a traditional true-triaxial bracket structure; and with the same confining pressure provided, materials and centrifuge load can be greatly saved.