A tethered balloon comprises a balloon, a tethered rope, an antenna, a cable, a rotation device and a fixation device, wherein the rotation device is hung under the balloon; the rotation device comprises a rotation assembly and a support fixed on the rotation assembly; the rotation assembly comprises a bearing base, a bearing set stored by the bearing base and a spindle passing the bearing set, and the spindle is connected to the balloon and rotates with motion of the balloon; the bearing set is used to offset torsion of the spindle to the bearing set and keeps the position of the bearing base unchanged; the fixation device comprises a storage tube fixed on the support; the tethered rope is fixed on the support; the cable is connected to the antenna and partially stored in the storage tube; and because of the unchanged position of the bearing base, the position of the support is also kept unchanged. The tethered balloon provided by the invention is characterized in that the support does not rotate along with changing of the direction of the balloon, and thus the tethered balloon and the cable fixed on the support do not rotate. In this way, winding of the tethered rope and the cable is effectively prevented, and the worse problem of twisting and breaking of the tethered rope or the cable can be effectively prevented.