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 . <EOS>