The invention relates to a marking device floating in a
wetland for movement. The marking device comprises a left
drive wheel 1, a right
drive wheel 3, a marker, a central processor and a navigation processor, wherein the left
drive wheel 1 is connected with the right drive wheel 3 through a bridging device 3; drive motors are arranged in the left drive wheel 1 and the right drive wheel 3; the marker comprises a group of round wheels 6 and a
paddle 6; the round wheels 7 are arranged at the upper part of the
paddle 6; the round wheels 7 pass through the bridging device 2; a locating
signal receiving and control device, a battery and a balance weight adjusting device are arranged at the connected part, of the bridging device, on the left drive wheel 1 and the right drive wheel 3; a battery and a field position sensing device are arranged on the bridging device; the central processor is in communication connection with the field position sensing device, the marker and the
drive motor; and the navigation processor is in communication connection with the central processor. The action of the marking device is independent of a running gear and is controlled by the field position sensing device, so that running and marking actions are not associated and are more stable; the space position of a
robot in the field is calculated and determined by the navigation processor; and the
centimeter level can be achieved in precision.