The invention discloses an unmanned automatic-positioning carried floating body. The unmanned automatic-positioning carried floating body comprises a main body, a superstructure and bottom counterweights, a direct current motor is mounted in the main motor, the output end of the direct current motor is connected with an electromagnetic clutch, the electromagnetic clutch is connected with blades of an azimuth-rotating steering rudder through a gear bearing, and further connected with a water jet propeller, a nozzle of the water jet propeller is connected with an annular water outlet pipeline, a check valve is mounted in the annular water outlet pipeline, a plurality of nozzle pipes are uniformly distributed on the circumference of the annular water outlet pipeline, and electric speed control valves are mounted on the nozzle pipes. According to the invention, the overall layout design is reasonable, the space is fully utilized, and the counterweights are reasonably distributed, so that the unmanned automatic-positioning carried floating body has waterborne performances of good stability, seakeeping performances and the like of the ordinary buoy, and further has the characteristic of capability of moving forwards on the water at a certain speed, and has the regionality which is not monitored by the ordinary buoy.