Abstract: Medium temperature coal tar pitch with quinoline insoluble compounds removed was used as the raw material. Coal-based needle coke was prepared in a home-made reactor with a magnetic field. The temperature and the maximum pressure for the formation of the mesophase under the magnetic field were discussed during the preparation of the needle coke. The structure and electrochemical properties of the needle coke prepared under different conditions were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Under the action of the magnetic field, when the maximum pressure is 0.4 MPa and the maximum temperature is 520℃, the needle coke has the best structure and electrochemical properties.