The utility model provides a mounting tool is transferred to undersea device, include: the center pin is formed with a screw thread portion on its lateral surface, go up the lid, the seal cover is established on the center pin, lower casing, the cover is established on the center pin, its upper end is connected with the lower extreme of last lid, lower extreme and center pin sealing contact, on its lateral surface along the circumference equipartition wear to be equipped with a plurality of piston boits, the elasticity catch corresponds to overlap to be established at each the outer end outside of piston boit to the bearing is on the protruding ring ear of establishing in the external surface of inferior valve, driving movable sleeve, placing under in the ring cavity that forms between casing and the center pin, its and screw portion looks spiro union are equipped with the guide conical surface on its lateral surface, and the guide conical surface is from top to bottom towards the axle center slope setting of driving movable sleeve, and the piston boit lies in the downside of the guide conical surface, and it is inner to form and guide conical surface assorted inclined plane, and lower casing and driving is equipped with one in addition and can prevents to drive the movable sleeve pivoted and prevent commentaries on classics portion between the movable sleeve. The utility model discloses can realize connection and release simple to underwater wellhead, safe and reliable.