The invention discloses a construction method of a 
deep water high 
pile bearing platform steel hanging box 
cofferdam. The construction method comprises the following steps: 1) design of a steel hanging box 
cofferdam: Larson steel plate piles are adopted as wall plates of the steel hanging box 
cofferdam; 2) 
assembly and placement of the steel hanging box cofferdam: the steel hanging box cofferdam adopts high 
assembly and overall placement technologies; 3) bottom cover concrete construction: a bottom cover construction process is performed twice; after primary bottom covering, water in the steelhanging box cofferdam is extracted to a bottom cover surface; and then, the secondary bottom cover concrete 
casting is performed; and 4) disassembly of the steel hanging box cofferdam: after a bearing platform and part of 
underwater piers are constructed, the water is injected in the steel hanging box cofferdam to reach balanced inner and outer water levels; and the steel hanging box cofferdam isdisassembled. In the construction method, through the Larson steel plate piles as the wall plates of the steel hanging box cofferdam and twice bottom cover construction process, the construction progress can be accelerated, the economical cost is saved, and the 
engineering quality is guaranteed.