Spherical common-bottom rocket storage tank with simplified structure

The utility model discloses a spherical common-bottom rocket storage tank with a simplified structure, which belongs to the technical field of rockets and comprises a storage tank front ball bottom at the upper end and a storage tank rear ball bottom at the lower end, a front tank shell is connected below the storage tank front ball bottom, and a rear tank shell is connected above the storage tank rear ball bottom; the front box shell and the rear box shell are connected through a common-bottom r-shaped ring; the outer side surfaces of the front box shell, the rear box shell and the common-bottom r-shaped ring are flush with one another; the inner side of the common-bottom r-shaped ring is connected with a spherical common bottom, the spherical common bottom is in a spherical surface shape protruding upwards or downwards, the upper storage tank and the lower storage tank are separated by the spherical common bottom in a sealed mode, and a common-bottom heat insulation layer is arranged on the lower surface of