Test device for simulating instability of excavation face of shield tunnel

The utility model discloses a test device for simulating instability of a shield tunnel excavation face, which comprises a test module, a driving module, a control module and a monitoring module, side plates on the periphery of an uncovered test box body are all made of transparent materials except a right side plate, and a sealing rubber strip is arranged on a contact face of a shield tunnel model and a front side plate of the uncovered test box body. The driving module comprises a mounting base, an electric push rod, a servo motor and a power supply seat; the right ends of the servo motor and the electric push rod are flush and mounted on the vertical power supply seat at intervals up and down; the control module comprises an electric control box supporting frame and an electric control box which is installed on the electric control box supporting frame and connected with the servo motor through a circuit. The monitoring module comprises a displacement sensor, a plurality of soil pressure sensors, a data ac