The invention discloses a controllable bendable tube structure, comprising a plurality of first and second segments in tubular shape and connected serially at intervals. The two ends, along the axis of the bendable tube structure, of each first segment are provided with C-shaped meshing portions respectively; the two ends, along the axis of the bendable tube structure, of each second segment are provided with a C-shaped notch and spherical protrusion matching with the C-shaped meshing portions; in case of serial connection, the spherical protrusions of the second segments may be clamped in theC-shaped meshing portions of the adjacent first segments such that the C-shaped meshing portions of the adjacent first segments may be embedded in the C-shaped notches of the second segments; when the bendable tube structure is bent, the C-shaped meshing portions of the first segments may relatively move in the C-shaped notches of the second segments. The controllable bendable tube structure is formed by serially connecting two types of segments, having different structures, at intervals; the two ends of each segment are designed in center symmetric structure; a processing technique can be simplified; manufacturing simplicity is improved; the segments are fastened firmly in great tightness; the bending angle of the bendable tube structure is flexible to control during bending.