Three-axis tensile tester for soil body

The invention provides a three-axis tensile tester for a soil body. A sample three-axis tensile linking device is formed in a space formed by horizontally loaded fixing frames, an operation platform and a top plate, and is provided with eight sample force dragging plates adhered to each side of a cube-shaped sample, wherein each sample force dragging plate is connected with a loading shaft through a dynamometer, the loading shafts are connected with a stretching device. The three-axis tensile tester is further provided with a photoelectric displacement sensor for detecting movement of each sample force dragging plate; the photoelectric displacement sensor, the dynamometers and the stretching device are respectively connected with a signal converter connected with a computer. By virtue of the technical scheme, a feasible tester is provided, and is used for testing the strength characteristics and creep characteristics of the cube-shaped sample under three-axis tensile condition, the testing accuracy and the testing success ratio are high, the practicability is high, and the three-axis tensile tester has the characteristics of simple structure, convenience in operate, stability in control, reliable data, safety, economical efficiency and the like.