Combined type sealing device for wellhead under pressure

The utility model discloses a combined type sealing device for a wellhead under pressure, relates to equipment used in oil fields, and particularly relates to a wellhead sealing device. The combined type sealing device for the wellhead under pressure comprises an upper beam which is arranged on the top portion and a single gate disc blowout preventer which is arranged under the upper beam, the upper beam is connected with the left end of the blowout preventer and the right end of the blowout preventer respectively through two studs, flowing clamping slips are arranged on the lower face of the upper beam, a lower beam and a middle beam are arranged between the single gate disc blowout preventer and the upper beam from bottom to top, a rising short connector is arrange on the lower beam, a sealing backing ring is arranged on the end portion of the rising short connector, a ring-shaped blowout preventer is arranged on the upper face of the middle beam, fixed slips are arranged on the upper portion of the ring-sh