The utility model discloses a steel wire rope locking device which can lock a steel wire rope and serve as a steel wire rope knot. The locking device comprises two slip pieces and a barrel, outer circles of the slip pieces are conical, conical inner circles corresponding to the outer circles of the slip pieces are arranged in the barrel, and the slip pieces are installed in the barrel and pressed tightly through press caps. A head of the steel wire rope penetrates through the barrel, and the slip pieces enable the steel wire rope to be clamped more and more tightly. The steel wire rope locking device has the advantages of being simple in operation, convenient to use, high in safety and practicability, and capable of saving time and labor. In addition, the steel wire rope locking device is small in size, reasonable in structure, easy to machine and safe and reliable in work, and can adapt to steel wire ropes with different diameters just by replacing corresponding slip pieces, so the application range is wide, and the excellent application effect can be achieved.