High pile bearing platform cofferdam and cofferdam construction method

The invention discloses a high pile bearing platform cofferdam and a cofferdam construction method. The cofferdam comprises a bearing structure, a locking and limiting structure and an adjusting cushion layer; the bearing structure comprises an annular bearing tray, an annular plug and a rubber sealing body, and a waterstop rubber pad is arranged at the upper end of the annular bearing tray; the locking and limiting structure comprises a bracket structure, threaded steel and an annular limiting beam, the threaded steel is provided with two locking devices, and the annular limiting beam is arranged on the upper portion of the annular bearing tray; and the adjusting cushion layer is arranged on the upper portion of the bearing structure. Due to integration of the bearing structure, the locking and limiting structure and the adjusting cushion layer, the whole high pile bearing platform cofferdam is in an interlocked mode, the manufacturing cost of the cofferdam can be effectively reduced,and firmness is high; ne