The utility model discloses a huge cyclic annular steel overhead bin cofferdam structure, include: a plurality of first section piece and second section pieces that splice each other, end -to -end connection is annular structure and vertical setting, the quantity of second section piece is even number, and with the center of annular structure is symmetry setting, wherein, first section piece is including the first mainboard body, second section piece is including personally experiencing sth. Part of the body through the second daughter board body and the third daughter board of the connection of a plurality of flexible rotating -structure each other, flexible rotating -structure, including set up respectively the second daughter board body with the third daughter board body is the first component and the second component at relative position each other, the utility model discloses a set up flexiblely rotating device can adapt to the flexible and rotation under uniform temperature change effect under the prerequisite of guaranteeing close water effect and structure atress, eliminate the unfavorable effect that the temperature variation brought to the annular structure.