Abstract: Titanium alloys can prolong the service life of ship structures and equipment due to the high strength and excellent corrosion resistance, and are widely used in the field of shipbuilding engineering. The traditional fusion welding process can result in defects such as porosity and inclusions during the welding process of titanium alloys, which will reduce the mechanical property of the joint. As a solid phase joining technology, friction stir welding (FSW) not only avoids fusion welding defects but also offers advantages such as low residual stress, low deformation, and high strength. Therefore, it has great potential for application in marine titanium alloy connection. In this paper, the design of welding tool and welding process control of the FSW are reviewed, and the microstructure evolution and mechanical property of the FSW joints of the marine titanium alloy are reviewed. Strategies for controlling and improving the technical issues in friction stir welding for marine titanium alloy are proposed, so are the development directions of friction stir welding for marine titanium alloy.