In the construction of vibroflotation piles with traditional flat barges and crawler cranes under wave conditions，there are problems of large pile position deviation，low hourly interest rate，and high potential safety hazards.Therefore，this paper proposes a technical scheme for underwater vibroflotation pile construction featuring grab dredger reconstruction with spud positioning and feed vibroflotation by transforming the dredger，improving vibroflotation equipment，and optimizing construction technology in a breakwater head transformation project in Tangshan Port，and the feasibility of the scheme is verified.The results show that the scheme meets the requirements of construction safety and pile position accuracy，and it is worth popularizing under similar working conditions.Through modular reconstruction，the application scope of the dredge is expanded.The pile quality and hourly interest rate under wave conditions are improved，and the project cost is saved.