The invention relates to the technical field of ships, in particular to a ship gas lubrication drag reduction system and a ship. The ship gas lubrication drag reduction system includes an air supply component and an airflow ejection portion, the airflow ejection portion is arranged at the bottom of the ship, is in communication with the air supply component and can eject airflow to form a drag reduction lubrication layer at the bottom of the ship; and the ship gas lubrication drag reduction system further includes an air supplement container which is in communication with the airflow ejectionportion, can store gas in advance and can supplement the airflow ejection portion for the gas after the drag reduction lubrication layer is formed. The ship gas lubrication drag reduction system is provided with the gas supplement container, small-flow gas can be supplemented to the drag reduction lubrication layer in the operation process after the ship gas lubrication drag reduction system is started, the drag reduction lubrication layer can be maintained stable, the air supply component does not need to be started for air supplementing, the power loss is accordingly reduced, and long-term stable use of the system is better ensured.