In order to develop an offshore deep-water wharf that can better adapt to soft foundation and severe wave conditions，a new type of entirely prefabricated offshore deep-water wharf with suction bucket foundations and circular caissons is proposed by combining the advantages of suction bucket foundations and circular caissons. Its structural composition，plane layout and construction technology are expounded，and its bearing characteristics are analyzed. The structure can be arranged with berths on the shore side，and can also be used as a breakwater on the sea side. It has strong wave resistance，good bearing performance，high structural rigidity，good durability，low cost and little impact on the environment，and has wide application prospects. Compared with the suction bucket without compartment，this new structure greatly improves the anti-slip and anti-overturning ability by setting the inner bucket and clapboards. Penetration damage can significantly reduce the bearing capacity of the foundation when it is in place，and it is recommended to consider it in the design.