Abstract: A packing bag with an air cushion, the bag unit comprising a sealing part at its top and a containing part at its bottom, wherein, the bag unit of the sealing part is a single-layered structure, on its inside are several matching snap strips, the bag unit of the containing part is in the form of a pouch enveloped by partition areas between the inside bag and the outside bag, on one corner of the outside bag is an air nozzle, and on two sides of the containing part are carrying handles, when such a structure is put in use, air is inflated through the air nozzle into the pouch of the containing part, so the pouch is filled with air between the outside and the inside bags, forming a bag unit filled a layer of air to accommodate fresh foods, fragile objects or precious items, etc.