The invention relates to a ship combined thruster. The thruster consists of a plurality of thrusters, a dynamic connecting shaft, a fixed frame, a protective block screen frame, a dynamic transfer fixed frame, a dynamic transfer case, a stable bracket and mechanical power. The thruster has the advantages of changing minor high-power subscooters into a plurality of small-power subscooters, greatly increasing the underwater reverse thrust acting force so as to accelerate the navigation speed of a ship under a condition that the power is not increased, and save massive dynamic resources.