The utility model provides a tunnel simulation test plane strain test bench, including test bench main part frame and pressure cell, still include 2 sets of gas pressurized systems, test bench main part frame is including the base, the floorbar, the left side roof beam, the right side roof beam, preceding baffle, the backplate, the back timber, many preceding strengthening ribs, many back strengthening ribs, organic glass board and 3 gasbags, be provided with the excavation hole on the organic glass board, be provided with a plurality of line holes of sending corresponding to excavating hole department on the backplate, the both sides and the top position of test bench main part frame inner chamber are equipped with 3 gasbags, the gas outlet of connecting one of them cover gas pressurized system is taken over to the gasbag that is located test bench main part frame inner chamber both sides through ventilating, the gas outlet of connecting another set gas pressurized system is taken over to the gasbag that is located test bench main part frame inner chamber top through ventilating. Its advantage does, and is easy and simple to handle, and the loading is convenient, and the loading ability is big, and has reached the loaded requirement of voltage -sharing fabulously, and the load mode is nimble, and the perspectivity is good, and similar material drying time is short, and testing speed is fast.