Ship unloader marine transportation loading and unloading system and loading and unloading method

The invention provides a ship unloader marine transportation loading and unloading system and a loading and unloading method. The system comprises a ship loading wharf, a first roll-on and roll-off rail is arranged on the ship loading wharf, the first roll-on and roll-off rail is arranged in the first direction and used for bearing a ship unloader, and the length direction of the ship unloader is parallel to the first direction; a barge comprising: a hull; the second roll-on-roll-off rail is arranged on the ship body in the first direction and used for being in butt joint with the first roll-on-roll-off rail and bearing the ship unloader; the third roll-on and roll-off rail is arranged in the second direction and intersects with the second roll-on and roll-off rail; the berthing wharf is provided with a fourth roll-on-roll-off rail, and the fourth roll-on-roll-off rail is used for being in butt joint with the third roll-on-roll-off rail and bearing the ship unloader; the traction mechanism is arranged on the