The invention discloses a deep-sea working ROV (Remotely Operated Vehicle) propeller system. An ROV controller can generate a speed control instruction of six degrees of freedom according to the current motion state of an ROV; a communication unit adopts a TCP (Transmission Control Protocol)/IP (Internet Protocol) network communication mode and transmits the speed control instruction generated by the ROV controller to a thrust distribution unit; a propeller unit comprises four horizontal propellers and three vertical propellers; the thrust distribution unit decomposes the instruction according to the received speed control instruction, and the obtained thrust values of all the propellers are transmitted to a driving unit; the driving unit outputs corresponding voltage signals according to the received thrust values and transmits the voltage signals to a propeller proportional valve, and opening and closing of the propeller proportional valve is adjusted; a hydraulic unit transmits hydraulic oil to the propeller unit through the propeller proportional valve. The deep-sea working ROV propeller system can improve the execution capability and efficiency of a propelling system.