Analog simulation experiment device capable of preventing middle expansion of planar model

The utility model discloses an analog simulation experiment device capable of preventing the middle of a planar model from expanding. The device comprises a base, a plane similarity simulation experiment frame and an anti-expansion device, the anti-expansion device comprises bottom connecting channel steel, a front side pressing device, an upper threaded pull rod, a rear side pressing device, a first pin shaft, a second pin shaft, a front side pressing nut and a rear side pressing nut; and the upper threaded pull rod is arranged above the middle part of the plane analog simulation experiment frame and is used for tensioning the upper ends of the front side pressing device and the rear side pressing device, so that the front side pressing device and the rear side pressing device clamp the front side of the middle part of the plane analog simulation experiment frame and the rear side of the middle part of the plane analog simulation experiment frame. According to the utility model, the stress conditions of the