Support for improving lateral rigidity of reinforced earth retaining wall model test box

The utility model discloses a support for improving lateral rigidity of a reinforced earth retaining wall model test box. The support is characterized in that the front ends and the rear ends of the bottoms of two lateral supports (1) are connected in a threaded manner through a front pull rod (2a) and a rear pull rod (2b) respectively, the model test box (4) is disposed among the two lateral supports (1), the front pull rod (2a) and the rear pull rod (2b), side plates (4a) of the model test box (4) fit with the lateral supports (1), and the front ends of the tops of the two lateral supports (1) are connected with a front connecting rod (3a) penetrating the side plates (4a) in a threaded manner. The support can laterally constrain the reinforced earth retaining wall model test box well to improve lateral rigidity of a box body, a model test is ensured not to be affected greatly by lateral deformation of the box body, and a test result is enabled to be more accurate; the support is detachable, reusable, convenient to store and suitable for model boxes different in size.