Claw-shaped safety hook

The utility model discloses a claw-shaped safety hook. The coupler knuckle comprises a coupler knuckle body, a coupler body and a self-locking safety device which is arranged on the coupler body and can lock swing of the coupler knuckle body. Wherein the top end of the hook body is connected with one end of the coupler knuckle through a first pin shaft, the coupler knuckle can rotate around the first pin shaft, the tail end of the hook body is a coupler knuckle opening, the bottom end of the coupler knuckle is a coupler knuckle opening, the coupler knuckle opening is provided with a protrudingstructure, a groove is formed in the coupler knuckle opening, and the protruding structure of the coupler knuckle opening is matched with the groove of the coupler knuckle opening. A notch is furtherformed in one side of the coupler knuckle; the self-locking safety device comprises a safety main body, a spring and a first cylindrical pin; the safety body is of a T-shaped structure. The left sideof the safety main body is