Tire assembly drum

The invention provides a tire assembly drum which is provided with an attachment surface for receiving a first tire layer and is further provided with two axially separated supporting zones. The firsttire layer extends axially to cross the two supporting zones, each supporting zone is provided with a plurality of rotating bodies which are uniformly distributed circumferentially, the rotating bodies can be driven to rotate in a same direction to be positioned in a first position or a second position synchronously, the rotating radiuses of the rotating bodies in the rotating direction are overlapped without interfering with each other, a first supporting surface for supporting the first tire layer is formed in the supporting zone in the first position, the first supporting surface and the attachment surface are located on a same circumferential surface, an annular sunken part is formed in the supporting area in the second position and a second supporting surface is formed thereon, and the second supporting surf