Because the cast-in-place beams of the traditional high-piled wharf have many hidden dangers in the construction of water operations, the construction quality is greatly affected by the level of the construction team and the offshore wind and waves, and the construction efficiency is low, the paper studies the key construction technology of the integration of large-volume beam-assembled formwork and steel cages, proposes to model and produce the template by TEKLA software, produce the steel cages in a professional prefabricated yard, and transport them to hoist on site.The results show that the integrated technology of prefabricated beam can save the construction cost, improve the overall quality of the beam, effectively shorten the project construction period, and improve the operation safety.