The invention provides an electric thruster for submarines and ships. The electric thruster comprises a rotor seal shell, a variable-frequency motor rotor, a rotating shaft, a variable-frequency motor
stator, a front bearing, a back bearing, a seal
flange, a
propeller, a variable-frequency speed
governor and a variable-frequency motor shell; the rotor seal shell is made of a hard non-
metal material, reinforcing ribs are arranged on the outer surface of the rotor seal shell in the length direction, a front-end opening of the rotor seal shell is fixedly connected with the seal
flange, the circle center of the seal
flange is provided with the front bearing, the back-end circle center of the seal flange is provided with a bearing sleeve and the back bearing, the variable-frequency motor rotor is arranged in the rotor seal shell and supported between the front bearing and the back bearing to freely rotate through the rotating shaft, and the front end of the rotating shaft stretches out of a ship shell for installing the
propeller; the variable-frequency motor
stator is integrally installed outside the rotor seal shell in a sleeving mode, the variable-frequency motor shell is installed outside the variable-frequency motor
stator in a sleeving mode, the front end of the variable-frequency motor shell is fixedly connected with the seal flange, a support seat is arranged at the center circle of the back end in the variable-frequency motor shell and installed outside the bearing sleeve in a sleeving mode, the lower portion of the variable-frequency motor shell is provided with a mounting base, and the variable-frequency motor stator is electrically connected with the variable-frequency speed
governor.