Indoor model test device by dynamic replacement method

The invention belongs to the technical field of geoenvironmental engineering, in particular to an indoor model test device by a dynamic replacement method, which comprises a pulley frame, a bracket, a fixing rod, a model case, a screwed reinforcement, an acceleration tester, a soil sample, a pressure box, a pulley, a dragrope, a hook, a rammer, a cut joint, a fixing hole and a strap. The pulley frame, the bracket, the fixing rod, the fixing hole, the pulley, the dragrope, the hook and the rammer form a loading system, the bracket is welded at he lower end of the pulley frame, the fixing rod is welded at the bottom end of the bracket, the model case comprises two rectangular bodies with hollow insides, the two rectangular bodies are connected through the screwed reinforcement, the cut joint is positioned between the two rectangular bodies, the fixing hole is arranged on the model case, and the fixing rod is inserted into the fixing hole; the pulley is hung on the pulley frame, one end of the dragrope is connec