The invention discloses a semi-submerged ship floating-loading facility for a large marine structure, belonging to the field of sunken vessel salvage. The semi-submerged ship floating-loading facility comprises a semi-submerged ship, a lifting and floating barge 1 and a lifting and floating barge 2, wherein the lifting and floating barge 1 is connected with the semi-submerged ship via crossed strong cables, and the two crossed strong cables are respectively connected with the head and the tail of the lifting and floating barge 1; the lifting and floating barge 2 is also connected with the semi-submerged ship via strong cables, and the two strong cables are respectively connected with the head and the tail of the lifting and floating barge 2; a to-be-salvaged shipwreck is fixed between the lifting and floating barge 1 and the lifting and floating barge 2 via the strong cables and a lifting system. According to the invention, a large marine structure or ship without buoyancy is lifted up and allowed to float on a water surface via the two large lifting and floating barges, then safely loaded onto the semi-submerged ship via a tugboat and a winch, and finally transported after floating on the water surface in virtue of the semi-submerged ship; so a reliable method is provided for loading and transporting of special marine structures.