Indoor simulation test device for influence of excavation of ultra-deep foundation pit

The invention relates to an indoor simulation test device for the influence of excavation of an ultra-deep foundation pit, and the device comprises a model box which is used for accommodating a soil body and is in a cuboid shape, and the top surface of the model box is provided with an opening; the foundation pit enclosure model is a two-frame enclosure model made of inner and outer aluminum alloy materials, after the two-frame enclosure model is positioned and placed in a soil body, mixed cement is injected, and after the cement is solidified, the cement is pulled out to form a cement enclosure wall body in the soil body; the subway tunnel ground entering and exiting model is customized by an aluminum alloy material, is divided into an underground tunnel section and a ground section, and is buried in the model box through a soil body; a plurality of LVDT displacement meters are fixed on the soil surface of the ground section and the vault and the haunch of the tunnel section through displacement meter bracke