An electronic expansion valve, comprising: a rotor, a stator, and a circuit board, the rotor comprising a permanent magnet, the permanent magnet comprising at least two pairs of magnetic poles, the stator comprising a coil and a coil bobbin, the coil being supported by the coil bobbin and electrically connected to the circuit board, and the coil bobbin being arranged around the permanent magnet, wherein the electronic expansion valve further comprises a Hall sensor, the Hall sensor is arranged at a periphery of the permanent magnet and is electrically connected to the circuit board, the Hall sensor comprises a sensing portion and a connecting portion, the sensing portion is electrically connected to the circuit board through the connecting portion, and the sensing portion is configured to sense a magnetic pole change of the permanent magnet; the sensing portion is always located in a corresponding radial region between two axial ends of the permanent magnet during an entire operation process of the rotor, or in a case that the rotor is located at a bottom dead center, at least part of a projection of the sensing portion in an axial direction of the rotor overlaps with at least part of a projection of the permanent magnet in the axial direction of the rotor; the electronic expansion valve further comprises a box body, part of the box body is formed through injection molding by using the stator as an insert, a box cavity is formed in the box body, and the circuit board and the Hall sensor are both arranged in the box cavity; the electronic expansion valve comprises a mounting portion, the sensing portion is fixedly connected to the mounting portion, and the mounting portion is arranged between the Hall sensor and the circuit board, wherein the mounting portion is a holder, which comprises a holder body, a first engagement portion and a second engagement portion, the Hall sensor is plugged into the first engagement portion, at least part of the second engagement portion and at least part of the circuit board are engaged with each other and fixed to each other by welding, the Hall sensor and the circuit board are engaged with each other by the holder and the circuit board is fixed to the box body. a rotor, a stator, and a circuit board, the rotor comprising a permanent magnet, the permanent magnet comprising at least two pairs of magnetic poles, the stator comprising a coil and a coil bobbin, the coil being supported by the coil bobbin and electrically connected to the circuit board, and the coil bobbin being arranged around the permanent magnet, wherein the electronic expansion valve further comprises a Hall sensor, the Hall sensor is arranged at a periphery of the permanent magnet and is electrically connected to the circuit board, the Hall sensor comprises a sensing portion and a connecting portion, the sensing portion is electrically connected to the circuit board through the connecting portion, and the sensing portion is configured to sense a magnetic pole change of the permanent magnet; the sensing portion is always located in a corresponding radial region between two axial ends of the permanent magnet during an entire operation process of the rotor, or in a case that the rotor is located at a bottom dead center, at least part of a projection of the sensing portion in an axial direction of the rotor overlaps with at least part of a projection of the permanent magnet in the axial direction of the rotor; the electronic expansion valve further comprises a box body, part of the box body is formed through injection molding by using the stator as an insert, a box cavity is formed in the box body, and the circuit board and the Hall sensor are both arranged in the box cavity; the electronic expansion valve comprises a mounting portion, the sensing portion is fixedly connected to the mounting portion, and the mounting portion is arranged between the Hall sensor and the circuit board, wherein the mounting portion is a holder, which comprises a holder body, a first engagement portion and a second engagement portion, the Hall sensor is plugged into the first engagement portion, at least part of the second engagement portion and at least part of the circuit board are engaged with each other and fixed to each other by welding, the Hall sensor and the circuit board are engaged with each other by the holder and the circuit board is fixed to the box body.