Low-friction rock true triaxial shear test clamp

The utility model provides a low-friction rock true triaxial shear test fixture. The low-friction rock true triaxial shear test fixture comprises an upper half shear box and a lower half shear box which are buckled up and down and have the same structure, each of the upper half shear box and the lower half shear box is of a U-shaped structure and comprises a thin-side U-shaped arm and a thick-side U-shaped arm which are different in thickness, the arm lengths of the thin-side U-shaped arm and the thick-side U-shaped arm are equal, and the arm end surfaces of the thin-side U-shaped arm and the thick-side U-shaped arm are flush with each other; the thin side U-shaped arm of the upper half shear box corresponds to the thick side U-shaped arm of the lower half shear box, and the thick side U-shaped arm of the upper half shear box corresponds to the thin side U-shaped arm of the lower half shear box; a sample mounting groove is formed between the upper half shear box and the lower half shear box; the top surface o