Open caisson sinking unearthing device

The utility model discloses an open caisson sinking and unearthing device, belongs to the technical field of building construction, and solves the problem that the service life of an open caisson is affected due to the fact that a grab bucket is easy to collide with the inner wall of the open caisson when the open caisson sinks and unearthed at present. A plurality of buffering mechanisms are fixed to the side wall of the protection barrel and arranged in the circumferential direction of the protection barrel at intervals. The end, away from the protective barrel, of each buffering mechanism is connected with a supporting piece, and the supporting pieces are used for being connected with the top of the open caisson. Specifically, when an open caisson sinks and unearthed, a lifting ring is connected with a lifting device, then the open caisson sinking and unearthed device is lifted to the position above the open caisson through the lifting device, then the position of the open caisson sinking and unearthed dev