Long pipe joint locking structure

The utility model discloses a long pipe joint locking structure which comprises a gear meshing driving mechanism, an outer hexagonal joint supporting piece used for supporting an outer hexagonal component of a sealing joint and a movable expanding and closing locking mechanism used for locking an outer hexagonal pipe joint, and the movable expanding and closing locking mechanism has an expanding state and a closing state. When in the expanding state, the sealing joint is provided with a flaring with the diameter larger than that of a circumcircle of the outer hexagonal pipe joint, a pre-connecting piece formed by pre-connecting the sealing joint, the outer hexagonal pipe joint and the long pipe penetrates through the flaring, and the outer hexagonal pipe joint is located in the flaring or an assembly piece formed by assembling the sealing joint, the outer hexagonal pipe joint and the long pipe is taken out through the flaring; when in a closed state, the gear is provided with a hexagonal locking ring matched