Rudder blade lifting device and rudder blade lifting method

The invention belongs to the technical field of ships, and discloses a rudder blade lifting device and a rudder blade lifting method.The rudder blade lifting device comprises a hoisting rope, a plurality of steering parts, a fixed pulley block, a movable pulley block and a driving mechanism, and the steering parts are sequentially arranged on an outer plate of a ship body at intervals along an L-shaped path; the hoisting rope can sequentially bypass the multiple steering parts, the extending directions of the hoisting ropes on the two sides of each steering part form an included angle, the fixed pulley block is arranged on the hull outer plate, the movable pulley block is arranged on the rudder blade, one end of the hoisting rope is connected to the output end of the driving mechanism, and the other end of the hoisting rope sequentially bypasses the steering parts, the movable pulley block and the fixed pulley block. The height of the rudder blade can be adjusted, the rudder blade lifting device is used in th