Sealing mechanism for marine gearbox gear shifting system

The invention discloses a sealing mechanism which is used for a marine gearbox gear shifting system and has the long service life and the high safety and reliability. The sealing mechanism comprises abox body oil cavity (50), a box body end cover (10), a rotation shaft (20), a sealing ring I (30) and a sealing ring II (40); the box body end cover (10) is provided with an oil inlet (11) which enables the box body oil cavity and an external oil supplying zone to communicate with each other and is fixedly connected with a gearbox body; the rotation shaft (20) is assembled in the box body oil cavity, one end of the rotation shaft (20) corresponds to the oil inlet end of the box body end cover, at least one annular sealing groove (21) is formed in the periphery of the rotation shaft (20), andan axial through hole (22) is formed in the axial direction; the sealing ring I is made of a corrosion-resistant material capable of bearing high oil pressure, and the sealing ring II is made of an elastic material; and the se