The utility model relates to an air outlet structure of a refrigerating machine of reefer container or a refrigerated container. The air outlet structure of a refrigerating machine solves the problem that the prior air outlet structure of a refrigerating machine causes inconveniency when the inner side of the cover plate of the air outlet opening is cleaned. The utility model constructs an air outlet structure of a refrigerating machine, which comprises a refrigerating machine support, an air outlet opening cover plate, a connecting plate, and a connecting plate bearing platform, the connecting plate is fixed and connected with the connecting plate bearing platform, the lower end of the air outlet cover plate is hinged with the connecting plate, and the upper end thereof is connected with the refrigerating machine support through a fixing piece. When the inner side of the air opening cover plate is being cleaned, the air outlet structure of a refrigerating machine of the utility model ensures that the upper end of the cover plate is deviated from the refrigerating machine to be turned over on the floor, and thus the utility model is convenient for cleaning.