Hydraulic lifting butt-joint device for installation offshore large-scale platform

A hydraulic lifting butting joint device for large sea platform, it consists of hydraulic motor, platform supporting member, barge, hydraulic member, platform bracket, positioning joint and bottom bracket. Upper and lower platform bracket are columniform. On platform bracket vertically set cylinder hydraulic member which consists of fixture cap, fixture leg, butt positioning active leg and they are connected in order by taking platform as the supporting point. Hydraulic sleeve and fixture leg are integrated as one; hydraulic piston is set on top of butting active leg and coupled on hydraulic sleeve. There sets hydraulic joint on top of hydraulic sleeve; There sets cylinder positioning joint on top of low bracket of the platform, there is concave cone on positioning joint, it matches with protruding cone set on low part of butt joint positioning active leg, hydraulic joint is connected to outlet of hydraulic motor on operation vessel. The equipment solves butt problem of platform, improve assembly speed of platform.