Underwater optical fiber rotary connector

The invention provides an underwater optical fiber rotary connector, and belongs to the field of optical fiber connectors. The underwater optical fiber rotary connector comprises an outer shell and a rotary shaft rotationally installed at one axial end of the outer shell, an axial force bearing capable of enabling the rotary shaft to bear axial thrust is installed between the outer shell and the rotary shaft, the outer shell is provided with a first stopping wall, and the first stopping wall faces the end, where the rotary shaft is installed, of the outer shell. The rotating shaft is provided with a second blocking wall opposite to the first blocking wall, and the axial force bearing is arranged between the first blocking wall and the second blocking wall in an abutting mode. The axial force bearing is arranged between the outer shell and the rotating shaft, so that the rotating shaft can rotate smoothly without moving into the outer shell under the condition that the rotating shaft bears axial thrust in a de