An airbag film roll retention structure includes a retaining engagement member mountable to an airbag film roll, a mounting section formed on one end of the retaining engagement member, a first alignment section formed on one end of the mounting section, abutting sections formed on an opposite end of the mounting section, and a second alignment section defined between the abutting sections, which are coupled to each other to be positioned on an axle assembly so as to achieve advantages, such as efficient mounting and positioning and ensuring center alignment to prevent eccentric oscillation.