Transmission structure and underwater driving device

The invention relates to the technical field of transmission, and discloses a transmission structure and an underwater driving device, which can reduce friction and improve transmission efficiency. The device comprises a shell with an opening, a partition plate, a first magnetic coupling, a second magnetic coupling and a first driving piece. The first magnetic coupling is provided with a first bearing outer sleeve, a first bearing inner sleeve, a driving magnetic wheel and a first annular gasket, and the first annular gasket is arranged between the first bearing outer sleeve and the first bearing inner sleeve; the second magnetic coupling is provided with a second bearing outer sleeve, a second bearing inner sleeve, a driven magnetic wheel and a second annular gasket, and the second annular gasket is arranged between the second bearing outer sleeve and the second bearing inner sleeve. By means of the first annular gasket and the second annular gasket, friction to the partition plate can be avoided, meanwhile,