Pipe joint self-tightening type high-pressure sealing device

The utility model discloses a self-tightening type high-pressure sealing device for a pipe joint. The high-pressure sealing device comprises an outer end cover (5), a connecting piece (1) connected with the outer end cover (5), and an elastic piece (3) arranged between the outer end cover (5) and the connecting piece (1), one end of the outer end cover (5) is a small end capable of extending intothe pipe connector (6), the small end of the outer end cover (5) is connected with the connecting piece (1), the other end of the outer end cover (5) is a large end incapable of extending into the pipe connector (6), and the face, close to the small end, of the large end of the outer end cover (5) is perpendicular to the axis. When the sealing device is used for sealing the pipe joint; according to the self-tightening high-pressure sealing device, self-tightening sealing is achieved under the action of pressure in the pipe without applying large initial pressure, and the self-tightening high-pressure sealing device is