An electric oil pump, comprising: a pump housing, a first rotor assembly, a pump shaft, a second rotor assembly, a stator assembly and a circuit board assembly, wherein the pump housing at least comprises a first housing, a second housing and a third housing, the electric oil pump has a pump inner chamber, the pump inner chamber comprises a first inner chamber and a second inner chamber, a sidewall forming the first inner chamber comprises part of the first housing and part of the second housing, a sidewall forming the second inner chamber comprises part of the third housing, and the third housing is configured to shield the circuit board assembly; the first rotor assembly is accommodated in the first inner chamber, and the second rotor assembly, the stator assembly and the circuit board assembly are accommodated in the second inner chamber; the electric oil pump comprises a partition portion, the partition portion is arranged between the first housing and the third housing, and the first inner chamber and the second inner chamber are located on two sides of the partition portion; and the first inner chamber is isolated from the second inner chamber by the partition portion, or the electric oil pump further comprises a sealing portion, and the first inner chamber is isolated from the second inner chamber by the partition portion and the sealing portion, the electric oil pump is characterized in that, the electric oil pump further comprising a partition plate to further isolate the second rotor assembly and the stator assembly from the circuit board assembly, wherein the partition plate is provided in the second inner chamber, the electric oil pump further comprises a second support portion, the second support portion is integrally formed with the partition plate, the second support portion is arranged protruding from the partition plate toward the second inner chamber, the electric oil pump comprises a second bearing, and the pump shaft is directly supported on the second support portion, or the pump shaft is supported on the second support portion through the second bearing. the pump housing at least comprises a first housing, a second housing and a third housing, the electric oil pump has a pump inner chamber, the pump inner chamber comprises a first inner chamber and a second inner chamber, a sidewall forming the first inner chamber comprises part of the first housing and part of the second housing, a sidewall forming the second inner chamber comprises part of the third housing, and the third housing is configured to shield the circuit board assembly; the first rotor assembly is accommodated in the first inner chamber, and the second rotor assembly, the stator assembly and the circuit board assembly are accommodated in the second inner chamber; the electric oil pump comprises a partition portion, the partition portion is arranged between the first housing and the third housing, and the first inner chamber and the second inner chamber are located on two sides of the partition portion; and the first inner chamber is isolated from the second inner chamber by the partition portion, or the electric oil pump further comprises a sealing portion, and the first inner chamber is isolated from the second inner chamber by the partition portion and the sealing portion, the electric oil pump is characterized in that, the electric oil pump further comprising a partition plate to further isolate the second rotor assembly and the stator assembly from the circuit board assembly, wherein the partition plate is provided in the second inner chamber, the electric oil pump further comprises a second support portion, the second support portion is integrally formed with the partition plate, the second support portion is arranged protruding from the partition plate toward the second inner chamber, the electric oil pump comprises a second bearing, and the pump shaft is directly supported on the second support portion, or the pump shaft is supported on the second support portion through the second bearing.