Pressure self-adaptive lip-shaped sealing device

The invention discloses a pressure self-adaptive lip-shaped sealing device. A groove is formed in a lip seal mounting base; a plurality of pressure regulating devices are arranged in the peripheral direction of the lip seal mounting base; inner ends of cavities of the pressure regulating devices communicate with a second axial hole in the back of a lip seal through a first axial hole in the lip seal mounting base; the second axial hole communicates with a medium cavity; a sealing cover is arranged in an opening in the outer end of each cavity; a piston capable of axially sliding is arranged in each cavity for dividing the corresponding cavity into a first chamber and a second chamber in a gastight mode; a piston rod is arranged in each first chamber; the outer end of each piston rod is fixedly arranged on the inner end surface of the corresponding piston in an eccentric mode; the inner end of each piston rod axially penetrates through the lip seal mounting base and the back part of the lip seal in the gastigh