The invention discloses a multi-purpose water
robot. The multi-purpose water
robot comprises a shell, a steering mechanism, a propelling mechanism and a
control system, the steering mechanism comprises a
rotating disc arranged in the shell in the transverse direction and a steering driving device fixed in the shell, the
rotating disc can be driven by the steering driving device to rotate around the central axis of the
rotating disc, and the shell floats on the water surface. When the rotating disc rotates, reaction torque applied to the shell can drive the shell to rotate in the direction opposite to the rotating direction of the rotating disc, and steering is achieved. By arranging the rotating disc driven by the steering driving device in the
machine body and utilizing the
angular momentum conservation principle, when the rotating disc rotates at a high speed around the central axis of the rotating disc, the shell can rotate at a high speed in the opposite direction under the driving of reaction torque, steering is achieved, and dependence on
lateral thrust or differential steering of a traditional
propeller is not needed; and the
turning radius is small, and the problem that a traditional water surface
robot is difficult to flexibly avoid obstacles due to the too large
turning radius is effectively solved.