Self-locking U-shaped quick shackle

The utility model belongs to the technical field of shackles, and discloses a self-locking type U-shaped quick shackle which comprises a U-shaped bolt body, bolt columns and a buckling piece, and the bolt columns penetrate through the two ends of the U-shaped bolt body respectively. One end of the bolt column is provided with a bolt head, and the other end of the bolt column is connected with the fastener; the buckling piece comprises a clamping seat, a movable buckle and a circular limiting pressing block; the clamping seat is hollow, an opening is formed in the bottom, and clamping grooves are formed in the two sides of the clamping seat respectively. The clamping grooves are respectively provided with a movable buckle; the movable buckle is provided with a contraction spring; according to the snap fastener, the novel snap fastener piece is combined with the bolt column, a snap fastener structure flexible to mount or dismount is formed, operation and maintenance personnel can dismount the shackle with one h