An electronic expansion valve, comprising a stepping motor, a Hall sensor, a controller and a circuit board, wherein the stepping motor comprises a rotor and a stator, the rotor comprises a permanent magnet, the permanent magnet comprises at least two pairs of magnetic poles, the stator comprises a coil and a stator core, the stator core comprises a magnetic conductive portion (2b1), and the magnetic conductive portion (2b1) is arranged at a periphery of the permanent magnet; the Hall sensor is arranged at the periphery of the permanent magnet, and the Hall sensor is located at one end of the magnetic conductive portion (2b 1); the Hall sensor comprises a body portion and a connecting portion, both the connecting portion and the coil are electrically connected to the circuit board, and the body portion is configured to sense magnetic pole changes of the permanent magnet; a sum of a length of the body portion and a length of the magnetic conductive portion (2b 1) is less than a length of the permanent magnet; the controller is configured to send a rotation command of the rotor to the stepping motor, the Hall sensor is configured to generate Hall signals according to magnetic pole changes of the rotor, and the controller is configured to acquire feedback signals; and characterized in that the stepping motor comprises an injection molding portion, and the injection molding portion comprises a first partition portion and a second partition portion; the electronic expansion valve has a first cavity and a second cavity, and the first cavity and the second cavity are isolated from each other by the first partition portion; the Hall sensor is arranged in the first cavity, the rotor is arranged in the second cavity, and the Hall sensor and the stator are isolated from each other by the second partition portion. the stepping motor comprises a rotor and a stator, the rotor comprises a permanent magnet, the permanent magnet comprises at least two pairs of magnetic poles, the stator comprises a coil and a stator core, the stator core comprises a magnetic conductive portion (2b1), and the magnetic conductive portion (2b1) is arranged at a periphery of the permanent magnet; the Hall sensor is arranged at the periphery of the permanent magnet, and the Hall sensor is located at one end of the magnetic conductive portion (2b 1); the Hall sensor comprises a body portion and a connecting portion, both the connecting portion and the coil are electrically connected to the circuit board, and the body portion is configured to sense magnetic pole changes of the permanent magnet; a sum of a length of the body portion and a length of the magnetic conductive portion (2b 1) is less than a length of the permanent magnet; the controller is configured to send a rotation command of the rotor to the stepping motor, the Hall sensor is configured to generate Hall signals according to magnetic pole changes of the rotor, and the controller is configured to acquire feedback signals; and characterized in that the stepping motor comprises an injection molding portion, and the injection molding portion comprises a first partition portion and a second partition portion; the electronic expansion valve has a first cavity and a second cavity, and the first cavity and the second cavity are isolated from each other by the first partition portion; the Hall sensor is arranged in the first cavity, the rotor is arranged in the second cavity, and the Hall sensor and the stator are isolated from each other by the second partition portion.