A probe transmission device comprises a driving shaft, a rope and a fixing piece, wherein an axial hole and a radial hole are formed in the driving shaft; the radial hole is communicated with the axial hole; the rope extends in the axial hole via the radial hole; and the fixing piece is arranged in the axial hole and fixes the rope in the axial hole. The axial hole and the radial hole are formed in the driving shaft of the probe transmission device, and the rope extends in the radial hole and is fixed by the fixing piece arranged in the axial hole. The rope fixing structure of the probe transmission device is simple; an element for fixing the rope on the surface of the driving shaft can be omitted; the surface of the driving shaft is smooth; and a phenomenon that the rope and the element intervene to each other is avoided.