Open caisson construction monitoring device

The utility model relates to the technical field of open caisson construction, in particular to an open caisson construction monitoring device which is used for monitoring whether a well wall is inclined or not and comprises a supporting part, a lifting part and a monitoring part, the supporting part is arranged on the outer side of the well wall in a sleeved mode, the lifting part is arranged at the upper end of the supporting part and comprises a supporting ring, and the monitoring part comprises a supporting frame, an annular support and a driven gear ring. The annular support is rotationally arranged at the lower end of the supporting frame, the annular support is fixedly sleeved with the driven gear ring, the supporting frame is fixedly arranged in the middle of the supporting ring, a driving gear is arranged at the lower end of the supporting ring and is in meshing transmission with the driven gear ring, and a monitoring part is arranged on one side of the lower end of the annular support and is in slid