The invention relates to a rudder-pod ship electric propulsion system which is characterized by comprising a rudder blade, a rudder horn, a pod, an electromotor and a propeller, wherein the rudder horn is mounted on a stern and is connected with the rudder blade; the pod is horizontally arranged on the rudder horn; the electromotor is arranged in the pod; the propeller is connected with the electromotor by a propeller shaft; the electromotor is used for receiving a power source and control signal from a hull to drive the propeller. According to the invention, the pod and a rudder are combined into a whole, modules such as the propeller and the pod are reserved, and a complicated rotating device is omitted; while the propulsion performance of a ship is guaranteed, the driveability of the ship is realized by the rudder. Therefore, major advantages of a full-rotating podded propulsor that the arrangement is flexible, the vibration is small, the noise is low, and the like are reserved, the defects of the full-rotating podded propulsor that the structure is complicated and the price is high are overcome, and the wider application of the rudder-pod ship electric propulsion system to more ship types is hopeful.