Closed chest drain dislodgement is usually treated by firstly giving petroleum jelly gauze and sterile dressing to plug the drain hole, and in most cases, it is also necessary to re-insert the closed chest drain. 1. When the closed chest drain is dislodged, the chest cavity is connected to the outside world through the drain hole to form an open pneumothorax, so firstly consider giving petroleum jelly gauze and sterile dressing to block the drain hole to form a closed pneumothorax. 2. According to the patient’s condition and chest radiograph or chest CT examination, consider whether to re-insert the closed chest drain, which is needed in most clinical cases. If the closed chest drain is dislodged, it is recommended to go to the hospital for further treatment.