The present invention discloses an ultra wide band conformal balloon antenna. The antenna comprises a big balloon, a small balloon, a main radiator, a feed body, a gasket and a radio frequency choker. The big balloon is internally provided with the small balloon; the main radiator is conformal to the surface of the small balloon, the main radiator comprises two aluminum foil belts along a latitudinal direction and a plurality of aluminum foil belts along a longitude direction, the widths of the aluminum foil belts are the same, and the main radiator is symmetrical to the feed body; the feed body is connected between the upper portion and the lower portion of the main radiator; the gasket is arranged between the upper portion and the lower portion of the feed body; and the radio frequency choker is arranged at the lower portion of the aluminum foil belts along the latitudinal direction. The ultra wide band conformal balloon antenna is wide in network coverage range, wide in available frequency band, high in data transmission efficiency, convenient and flexible in establishment of a wireless station and low in maintenance cost, and is suitable for a remote measurement system.