Disclosed is an air drop preventive automatic locker for operation of rope ladders. Safety lifting hooks are arranged on connecting protecting plates via turning hanging shafts, a fixed tongue plate is connected between the two protecting plates via fixed tongue plate bolts, a movable tongue plate is connected between the two protecting plates via a movable tongue plate fixing shaft, tension spring fixing shafts are penetratingly arranged at the bottoms of the protecting plates, and a tension spring is arranged between the movable tongue plate and the tension spring fixing shaft in the protecting plates. Due to the structure, the air drop preventive automatic locker for the operation of the rope ladders is simple in structure and convenient in use and is safe and reliable, and a locking distance is only 2cm and is much shorter than a required distance which is limited by a relevant and cannot exceed 20cm. In addition, the air drop preventive automatic locker for the operation of the rope ladders can effectively prevent air drop of workers, guarantees the personal safety of the workers, can reduce safety risks, innovates air drop preventive measures for the operation of the rope ladders, standardizes safety behaviors of operation fields, increases work safety, and can create considerable intangible benefit for enterprises and societies.