Dynamic true-triaxial apparatus for soil

The invention discloses a dynamic true-triaxial apparatus for soil. A top counter-force rack is provided with an axial electric cylinder; an axial adjusting piston is mounted in a rack support, and is upward connected with an axial hydraulic cylinder and a pressure chamber base in sequence, the pressure chamber base is upward encircled to form a pressure chamber with a pressure chamber top cover through a square cylinder wall, the middle part of the upper surface of the pressure chamber base is used for placing a sample, four faces of the sample are four pressure cavities, and the cylinder wall of each pressure cavity is provided with a lateral displacement measuring mechanism; a sample cap is arranged in the pressure chamber top cover, and is upward connected with an axial force transmission bar which is coaxially connected with the axial electric cylinder; and each sensor is connected with a signal acquisition part, and the signal acquisition part and a loading mechanism is connected with a loading control part. The dynamic true-triaxial apparatus for soil, provided by the invention, can respectively add dynamic load in three stress directions under a common stress condition in practical projects.