Based on the project example of upgrading a 1，000-ton wharf in Humen Port，Dongguan into a 50，000-ton wharf in situ，the composite structure of high-pile beam and sheet-pile is proposed through the analysis of the project status and existing problems.The composite structures of sheet-pile wall and high-pile beam-plate are integrated to form a whole unloading structure，which can effectively reduce the earth pressure on sheet-pile wall.The sheet pile structure can meet the construction requirements of deep water wharf with large tonnage.In this paper，the selection of renovation scheme is discussed and the structural analysis and calculation are carried out.According to the elastic theory，the finite element three-dimensional numerical model is established，and the calculation results meet the engineering requirements.The composite structure is proposed based on specific conditions，and has distinct structural characteristics，which can be used as reference for similar wharf upgrading projects.