The invention provides a small storage device for isobutene transportation. The small storage device for isobutene transportation is characterized in that the small storage device for isobutene transportation comprises a storage tank, a helmet, a mounting disc, a bracket, a guardrail, an air outlet, a valve, a stabilizing frame and a polymerization inhibitor mounting box; the mounting disc is arranged on the lower side of the storage tank, the storage tank is connected with the stabilizing frame through the mounting disc, and a mounting frame is arranged on the side surface of the storage tank; when isobutene needs to be transported, the bracket is mounted on the small storage device storing the isobutene, then the small storage device is transversely placed in a transportation vehicle, stability of the internal isobutene is ensured, shaking is reduced, and polymerization of the internal isobutene is reduced; and the interior of the small storage device is further provided with the polymerization inhibitor mounting box, during using, a polymerization inhibitor can be injected from the outer side of the polymerization inhibitor mounting box firstly, sealing is conducted after injecting, and during transporting, through the action of the polymerization inhibitor mounting box of the interior of the small storage device, occurrence of isobutene polymerization is reduced better.