Refrigerant safety control device, air conditioner, method and medium

The invention discloses a refrigerant safety control device, an air conditioner, a method and a medium, and is applied to the technical field of air conditioners. Refrigerant leakage detection and refrigerant safety control are carried out on the air conditioner on the basis of the concentration of the micro-combustible refrigerant detected by the main refrigerant sensor, so that harm to a human body caused by refrigerant leakage of the air conditioner can be effectively avoided; when the main refrigerant sensor does not meet the main condition, the standby refrigerant sensor can be switched to the main refrigerant sensor to continuously detect the concentration of the micro-combustible refrigerant near the air conditioner, so that the problems of refrigerant leakage detection and refrigerant safety control failure of the air conditioner caused by abnormality of the refrigerant sensors can be effectively prevented; and therefore, refrigerant leakage detection and refrigerant safety control of the air conditio