High-molecular high-strength ton bag capable of expanding volume

The utility model discloses a macromolecule high-strength ton bag capable of expanding volume, which relates to the technical field of ton bags and comprises a lower bag body, a middle bag body arranged on the top surface of the lower bag body, an upper bag body arranged on the top surface of the middle bag body, bag belts symmetrically arranged on the top surface of the upper bag body, and a plurality of reinforcing belts uniformly arranged between the upper bag body and the lower bag body. Each of the upper bag body, the middle bag body and the lower bag body comprises an outer layer, an interlayer arranged on the inner wall of the outer layer and an inner layer arranged on the inner wall of the interlayer; by using the wavy middle bag body, the volume of the ton bag can be reduced when the ton bag is not used, so that the ton bag is convenient to store or carry; meanwhile, the volume of the ton bag can be enlarged when the ton bag is used, more articles can be contained conveniently, and therefore the volu