The invention discloses a bidirectional alternative integral sealing device for main drive of a
tunnel boring machine. The device comprises a boring
machine adapter
flange, a boring
machine supportingring and an integral seal. A positioning ring is arranged outside the boring
machine supporting ring. The integral seal comprises a base body, three sealing rings and a detection ring. The cross section of the base body is of an L-shaped structure, the
tail end of the radial part is provided with a hydrophobic layer, and the
tail end of the axial part is provided with a positioning hook; the outer part of each sealing ring is annular, the inner part of each sealing ring is a U-shaped labyrinth ring cavity, each sealing ring is provided with a first outer framework, a first inner shell, a first limiting block, a second limiting block, an axial seal, a first radial seal and a second radial seal, the outer part of the detection ring is annular, the inner part of the detection ring is a U-shaped labyrinth ring cavity, and the detection ring is provided with a second outer framework, a second inner shell, a third limiting block, a fourth limiting block and a third radial seal. The base body hydrophobic layer, the axial seals, the radial seals and the labyrinth ring cavities are integrated, meanwhile, sealing
grease is injected, and the device has the advantages of good sealing performance, long service life, small disassembly and
assembly difficulty, low maintenance cost and the like.