Three-dimensional grouting testing device and testing method

The invention discloses a three-dimensional grouting testing device and testing method. The device comprises a model cabin frame, a packing space used for containing a rock and soil medium to be grouted is formed in the model cabin frame, a grouting pipe and grout outlet pipes inserted into the rock and soil medium to be grouted are arranged on the model cabin frame, a layer of aggregates free of edges and corners are arranged on the inner wall of the packing space, and thereby the boundary effect is eliminated; sensors connected with a monitoring platform are arranged inside the rock and soil medium to be grouted, a pressure-applying plate is arranged at one side of the packing space, the pressure-applying plate applies pressure to the rock and soil medium to be grouted, and thereby the rock and soil medium to be grouted is in the pressure-bearing state. The model cabin frame is packed with the rock and soil medium to be grouted and internally provided with the sensors in a synchronous mode, the grouting pip