The invention discloses a guide line bending device comprising a guide line fixing mechanism and a line bending mechanism. The guide line fixing mechanism comprises a first base, a second base and a central shaft, the central shaft simultaneously passes through one end of the first base and one end of the second base to be fixed, and rotating scales are arranged on the outer side of the central shaft by a circumference; the other end of the second base is provided with a clamp for fixing a guide line; the line bending mechanism includes a first line bending block and a second line bending block; and the first line bending block and the second line bending block are both connected to the end, close to the central shaft, of the upper surface of the second base, and the first line bending block and the second line bending block are oppositely arranged. The guide line bending device is used for fixing the guide line for connection through the clamp, the first base and the second base are rotated around the central shaft according to the required degree of curvature, and then the guide line can be bent.