Deepwater rotary switch

The utility model relates to a deepwater rotary switch, which comprises a shell, a knob and a switch, a mounting cavity is formed in the shell; the switch is fixedly mounted in the mounting cavity; one end of the switch is provided with a driving end for powering on or powering off the switch, and the other end of the switch is provided with a leading-out wire harness; the knob comprises a sealing driving part and a rotating part; the sealing driving part is inserted from one end of the shell and rotationally connected with the shell, and the rotating part is located outside the shell; a first sealing ring mounting groove is formed in the circumferential wall of the sealing driving part, and a first sealing ring is arranged in the first sealing ring mounting groove; the sealing driving part and the inner wall of the mounting cavity of the shell form dynamic sealing through a first sealing ring; a driving groove matched with the driving end in an inserting manner is formed in the inserting end surface of the s