The invention relates to an air supply system of a refrigerator, the refrigerator and an air supply method. The air supply method is characterized in that small separated circulations are formed by respective and independent air supplying in each area separated by laminating frames, elevation-type air supply is adopted in an upper area of a refrigerator body, diving-type air supply is adopted in a middle area of the refrigerator body, thus reverse circulation of the middle area of the refrigerator body is caused, and airflow disturbance is formed by joining downward airflow with reserve airflow. According to the air supply system of the refrigerator, the refrigerator and the air supply method, disclosed by the invention, independent air supply in each area of the refrigerator is realized, thus no dead corner is generated in the refrigerator, the temperature uniformity is good, the refrigerating efficiency is high, food cannot be directly blown by cold air, and the fresh preservation capacity of the food is obviously increased; in addition, the elevation-type air supply is matched with the diving-type air supply, thus the reserve circulation can be formed in local areas, the active airflow disturbance can be caused, the non-uniformity of refrigerating capacity is overcome, the loss of the refrigerating capacity is reduced, and the temperature balancing performance and the refrigerating efficiency are further increased.