The work aims to prolong the preservation time of fresh sweet corn at normal temperature, so as to provide conditions for normal temperature transportation. Made of high oxygen-permeable film and high permeable film with different area ratios, the fresh-keeping packaging bags were used for packaging and storage of sweet corn. The preservation experiment was carried out under the condition of t=(26±1)℃ and RH=(60±5)%, with naked sweet corn as the control group. The change in the concentration of oxygen and carbon dioxide in the packaging bag, the weight loss rate of sweet corn, the hardness of corn grain, the contents of soluble solids, total acid and VC and the sensory quality were measured and analyzed every day. In the naked group, the weight loss of sample was rapid and the content of soluble solids decreased significantly. By the second day of the experiment, the sweet corn had lost its commercial value. In the experimental group, due to different air permeability of the two films, the oxygen content in the packaging bag decreased rapidly and the carbon dioxide increased rapidly. This kind of storage environment effectively inhibited the physiological activities of sweet corn, such as respiration. The indexes such as nutrients and sensory evaluation of sweet corn were kept at a better level. The shelf life of sweet corn with functional packaging bags can be extended to 4-5 days.