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. <EOS>