The utility model provides a can realize that three dimensions is respectively to removing large -scale staight scissors appearance, wherein the staight scissors appearance includes test bench, automatically controlled cabinet, work platform, loading device, horizontal displacement restraint device, motion actuating mechanism, upper and lower shear box, grid preforming and loading board, automatically controlled cabinet, horizontal displacement restraint device, motion actuating mechanism and strutting arrangement all set up on test bench, loading device through the loading board make progress shear box, grid preforming and down shear box exert vertical pressure, the horizontal displacement restraint device links to each other with last shear box, the geosynthetic material that waits to carry on shear test is circularly, places the grid preforming in and down between the shear box, motion actuating mechanism drives down, and shear box carries out the three -dimensional removal in space, automatically controlled cabinet links to each other with loading device and motion actuating mechanism respectively. The utility model provides a current staight scissors appearance unipolar shear test can only carry out, cut the direction random, can't realize maximizing, problem that the experiment test result can't truly reflect engineering reality.