A lightweight paper tube structure capable of high loading is provided. The tube structure comprises an inner tube and an outer tube with an annular space being formed between the outer tube and the inner tube; a first paper ring and a second paper ring fitted at two ends of the annular space respectively, and a foamed body discposed in the annular space, the annular foamed body being supported between the outer tube and the inner tube. The structure enables the paper tube to retain a light weight and can also enhance the loading strength of the paper tube, thus achieving the substantial effect of preventing deformation.