An electric pump, comprising a pump housing, a rotor assembly, a stator assembly and an electronic control board, wherein the pump housing is provided with a pump inner chamber, the pump inner chamber comprises a first chamber and a second chamber, the rotor assembly is arranged in the first chamber, and the stator assembly and the electronic control board are arranged in the second chamber; the electric pump comprises an isolation sleeve, at least part of the isolation sleeve is arranged between the rotor assembly and the stator assembly, the first chamber is arranged on one side of the isolation sleeve, and the second chamber is arranged on another side of the isolation sleeve; the electric pump further comprises a heat dissipation plate, the isolation sleeve comprises a bottom portion, at least part of the heat dissipation plate is arranged between the electronic control board and the bottom portion; and at least part of the bottom portion is in direct contact with at least part of the heat dissipation plate, or silicone grease or silica gel is filled between at least part of the bottom portion and at least part of the heat dissipation plate, or a heat conducting patch is provided between at least part of the bottom portion and at least part of the heat dissipation plate; wherein the isolation sleeve is provided with a pump shaft position-limiting portion, the pump shaft position-limiting portion is formed at the bottom portion, the pump shaft position-limiting portion is configured to protrude toward the second chamber, the heat dissipation plate is provided with a through hole corresponding to the pump shaft position-limiting portion, characterized in that the pump shaft position-limiting portion is configured to pass through the through hole and be positioned to the heat dissipation plate. the pump housing is provided with a pump inner chamber, the pump inner chamber comprises a first chamber and a second chamber, the rotor assembly is arranged in the first chamber, and the stator assembly and the electronic control board are arranged in the second chamber; the electric pump comprises an isolation sleeve, at least part of the isolation sleeve is arranged between the rotor assembly and the stator assembly, the first chamber is arranged on one side of the isolation sleeve, and the second chamber is arranged on another side of the isolation sleeve; the electric pump further comprises a heat dissipation plate, the isolation sleeve comprises a bottom portion, at least part of the heat dissipation plate is arranged between the electronic control board and the bottom portion; and at least part of the bottom portion is in direct contact with at least part of the heat dissipation plate, or silicone grease or silica gel is filled between at least part of the bottom portion and at least part of the heat dissipation plate, or a heat conducting patch is provided between at least part of the bottom portion and at least part of the heat dissipation plate; wherein the isolation sleeve is provided with a pump shaft position-limiting portion, the pump shaft position-limiting portion is formed at the bottom portion, the pump shaft position-limiting portion is configured to protrude toward the second chamber, the heat dissipation plate is provided with a through hole corresponding to the pump shaft position-limiting portion, characterized in that the pump shaft position-limiting portion is configured to pass through the through hole and be positioned to the heat dissipation plate.