An inflatable packaging bag formed of a plurality of independent air bags joined to one another by way of heat-sealing, having an air inlet through which compressed air is supplied to inflate the independent air bags. Each independent air bag is formed of a top four thin-sheet flexible layers including a top layer, a bottom layer, a top air-valve layer, and a bottom air-valve layer, having heat sealed seams that seal the layers, constituting an enclosed air chamber such that when some of the independent air bags are punctured, the other independent air bags work normally to continue to protect storage items put inside the inflatable packaging bag and surrounded by the independent air bags.