Tunnel differential settlement monitoring device and monitoring method

The invention relates to the technical field of tunnel and underground engineering, and provides a tunnel differential settlement monitoring device and method.The device comprises a first fixing plate, a second fixing plate, a first bearing, a second bearing, a lever and a reading device, and the first fixing plate is arranged on the side wall of a tunnel; the second fixing plate is arranged on the tunnel side wall, and the first fixing plate and the second fixing plate are symmetrically arranged on the two sides of a tunnel construction joint; the first bearing is fixedly arranged on the first fixing plate; the second bearing is fixedly arranged on the second fixing plate; the lever penetrates through the first bearing and the second bearing respectively; a reading device is arranged at the end of the lever, the reading device is arranged at the end away from the first bearing, and the reading device is used for collecting tunnel displacement parameters, the manufacturing cost of the monitoring device is eff