The invention discloses a cable bending device. The cable bending device comprises a bending plate, a gear plate, a small gear, a gear driving motor, a base, a bending push air cylinder, a pneumatic apparatus, a fixed wheel set and a bending wheel set. When a cable enters the fixed wheel set, the bending plate is driven by the pneumatic apparatus to perform rightward translation so that the cablecan pass through the bending plate; then the bending plate is driven by the pneumatic apparatus to perform leftward translation, so that crucial bending is performed between a straight section and a circular arc section of the cable; and after the gear plate rotates to a limiting position, a thrust air cylinder is connected with the bending wheel set, the bending wheel set is pushed to move horizontally, and crucial bending is performed between the circular arc section and the straight section of the cable. The problem of bending transition between the straight section and the circular arc section of the cable is solved better.