The present invention relates to a buoyancy-type footbridge in which the height changes according to the water level, so that the buoyancy is adjusted according to the water level without installing a pier, so as not to be affected by the flow velocity of the river. The present invention is to install a bridge support in both sides of the river, the bridge support is fitted with a flow support to move up and down, the flow support is rotated left and right by a hydraulic motor, but the rotating plate is installed upwards, the swing plate is a swing bridge It is made by connecting the top plate of the top plate, a buoyant body is installed on the bottom surface of the top plate, a pump for filling or discharging water to the buoyant body, and connecting means for connecting the top plates to each other.
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