Self-spraying mechanical pumping integrated well completion wellhead sealing device

The utility model relates to a self-spraying and mechanical pumping integrated well completion wellhead sealing device which comprises a sealing cover, a blowout prevention pipe is screwed in an upper end opening of the sealing cover, a supporting pipe is inserted in the blowout prevention pipe, a supporting block is inserted in a lower end opening of the supporting pipe, a packing pressing cap is arranged in the supporting block and connected with a connecting short section arranged in a lower end opening of the sealing cover, and the connecting short section is connected with the sealing cover. The connecting nipple is fixedly connected with the inner wall of the sealing cover. The sealing device serves as a second sealing device for sealing wellhead pressure, and well control safety is guaranteed. The pressure bearing capacity and reliability of the pumping wellhead can be improved, well control safety is guaranteed, and the operation cost of emergency well killing, wellhead repairing and replacing and the