The utility model relates to a compact turns around propeller entirely for boats and ships, including driving motor, well case subassembly, the motor of coming about, the gear box of coming about, honeycomb duct, screw and water conservancy diversion cap, the front end at the screw center pin is established to the screw, and the honeycomb duct is located the screw outer loop, and the water conservancy diversion cap is located the end of screw center pin, its characterized in that, driving motor be inverter motor, be equipped with the driving motor seat on the well case subassembly, driving motor is fixed in installation driving motor seat, the gear box of coming about passes through the floating bearing to be installed in the below of well case subassembly, and driving motor's output shaft passes through driving motor seat, well case subassembly and the gear box of coming about, by the bevel gear pair drive screw center pin of tip, still be equipped with the motor cabinet of coming about on the well case subassembly, the motor of coming about is installed on the motor cabinet of coming about, and the gear of coming about that the motor output of coming about drove in the gear box of coming about makes the gear box of coming about use the floating bearing to rotate as the axle center.