Rail blocking device for preventing unexpected collision accident of traveling crane

The utility model discloses a rail blocking device for preventing an unexpected collision accident of a traveling crane. Working end faces of collided arc plates are arc end faces, and the lower ends of two symmetrical, parallel and upright collided arc plates are fixedly connected onto a base plate. Vertical and fixedly connected reinforcing ribs are evenly distributed between the two parrallel and upright collided arc plates, the top surfaces of the reinforcing ribs are equal to the cambered surface intersection points corresponding to the collided arc plates in height, and the bottom surfaces of the reinforcing ribs are fixedly connected onto the base plate. Symmetrical and parallel clamping plates are fixedly connected on both sides of the base plates in a direction opposite to the collided arc plates. The distance between the clamping plates is matched with the head width of a steel rail. Fixing bolt holes are evenly distributed in horizontal mode on plate surfaces of the clamping plates in the length di