True triaxial preparation device for deep in-situ rock containing internal stress

The invention relates to the technical field of deep rock in-situ simulation preparation, and discloses an internal stress-containing deep in-situ rock true triaxial preparation device, which comprises a mold, and the mold comprises a rectangular frame structure formed by sequentially connecting a rigid plate A, a rigid plate B, an elastic plate A and an elastic plate B, and further comprises a first axial compression device, the first axial pressing device comprises a top plate, a first hydraulic cylinder and a first pressing plate, the top plate is detachably connected to one end of the rectangular frame structure, the other end of the rectangular frame structure is detachably connected with a bottom plate, the first pressing plate is in sliding fit with the interior of the rectangular frame structure, and the first hydraulic cylinder can drive the first pressing plate to slide; a first grouting hole and a first grout return hole are formed in the lower end and the upper end of the side, close to the elasti