An electric pump, comprising a housing, a shaft, a stator assembly, and a rotor assembly, a chamber being formed in the housing, the chamber being partitioned by a partition into a wet chamber and a dry chamber, the stator assembly being arranged in the dry chamber, and the rotor assembly being arranged in the wet chamber, wherein: the shaft comprises a first portion and a second portion, the first portion is fixed to the partition, and the second portion is in non-direct contact with the partition; the rotor assembly is rotatable about the shaft, and the rotor assembly is sleeved on the shaft; the electric pump comprises a stop assembly, the stop assembly is configured to limit a position of the rotor assembly in the chamber and comprises a first stop and a second stop; and the first stop is configured to limit a position of the rotor assembly moving along the shaft in a direction away from the first portion, and the second stop is configured to limit a position of the rotor assembly moving along the shaft in a direction towards the first portion, the first stop is fixed to the second portion, and the second stop is fixed to the first portion, wherein: the first stop comprises a connecting element and a stop element, the connecting element is fixed to the second portion, and the stop element is arranged between the connecting element and the second portion and is pressed onto the second portion, wherein: the shaft comprises a connecting portion, and the connecting element is connected to the shaft via the connecting portion; the connecting portion comprises a threaded hole, and the threaded hole extends into the second portion; and the connecting element comprises a screw, the screw is in a threaded connection with the shaft, and the stop element is pressed onto the second portion of the shaft by the screw, wherein the stop element comprises an upper end surface and a lower end surface, the upper end surface is in contact with the screw, the lower end surface is in contact with the second portion, and at least the lower end surface of the stop element has a surface roughness smaller than Ra 1.6; and characterized in that the rotor assembly comprises an impeller comprising a lower plate and a bearing, the bearing is fixed to the rotor assembly by injection molding; and in an axial direction of the shaft, a surface, close to the second portion of the shaft, of the bearing is an upper end surface, the upper end surface of the bearing is spaced apart from the lower end surface of the stop element by a certain distance, and the upper end surface of the bearing is slightly higher than an upper end of the lower plate. the shaft comprises a first portion and a second portion, the first portion is fixed to the partition, and the second portion is in non-direct contact with the partition; the rotor assembly is rotatable about the shaft, and the rotor assembly is sleeved on the shaft; the electric pump comprises a stop assembly, the stop assembly is configured to limit a position of the rotor assembly in the chamber and comprises a first stop and a second stop; and the first stop is configured to limit a position of the rotor assembly moving along the shaft in a direction away from the first portion, and the second stop is configured to limit a position of the rotor assembly moving along the shaft in a direction towards the first portion, the first stop is fixed to the second portion, and the second stop is fixed to the first portion, wherein: the first stop comprises a connecting element and a stop element, the connecting element is fixed to the second portion, and the stop element is arranged between the connecting element and the second portion and is pressed onto the second portion, wherein: the shaft comprises a connecting portion, and the connecting element is connected to the shaft via the connecting portion; the connecting portion comprises a threaded hole, and the threaded hole extends into the second portion; and the connecting element comprises a screw, the screw is in a threaded connection with the shaft, and the stop element is pressed onto the second portion of the shaft by the screw, the first stop comprises a connecting element and a stop element, the connecting element is fixed to the second portion, and the stop element is arranged between the connecting element and the second portion and is pressed onto the second portion, wherein: the shaft comprises a connecting portion, and the connecting element is connected to the shaft via the connecting portion; the connecting portion comprises a threaded hole, and the threaded hole extends into the second portion; and the connecting element comprises a screw, the screw is in a threaded connection with the shaft, and the stop element is pressed onto the second portion of the shaft by the screw, wherein the stop element comprises an upper end surface and a lower end surface, the upper end surface is in contact with the screw, the lower end surface is in contact with the second portion, and at least the lower end surface of the stop element has a surface roughness smaller than Ra 1.6; and characterized in that the rotor assembly comprises an impeller comprising a lower plate and a bearing, the bearing is fixed to the rotor assembly by injection molding; and in an axial direction of the shaft, a surface, close to the second portion of the shaft, of the bearing is an upper end surface, the upper end surface of the bearing is spaced apart from the lower end surface of the stop element by a certain distance, and the upper end surface of the bearing is slightly higher than an upper end of the lower plate.