Balancing device for hydrographic survey unmanned ship and balancing method thereof

According to the technical scheme, the balancing device comprises an unmanned ship body, pull rods movably penetrate through the two sides of the unmanned ship body, the pull rods are used for pulling supporting rods to rotate, a rotating rod is rotationally connected to the unmanned ship body, a worm is installed on the rotating rod, and a worm gear is installed on a rotating pipe; the bottom end of the unmanned ship body is in sliding connection with a balancing weight, and four second hydraulic cylinders are rotationally connected to the corners of the bottom of the unmanned ship body. The driving motor is controlled to rotate, the four supporting rods rotate outwards, the floating blocks are unfolded, the contact area between the unmanned ship body and the water surface is increased, the stability of the unmanned ship body is guaranteed, the double-shaft motor drives the supporting rods, the supporting rods enable the floating blocks to abut against reefs or sand beaches making contact with the bottom, an