The effect of fluorination treatment on La0.94Mg0.06Ni3.49Co0.73Mn0.12Al0.20 hydrogen storage alloy was studied to improve its electrical chemical properties. The results of X-ray diffraction(XRD) and Scanning electron microscope(SEM) showed that the phase composition of the alloy were changed after fluorination treatment, there is a new phase that is MgF2; some particles of MgF2 were formed on the surface of the alloy, When the concentration of NH4F was 0.3 mol/L, the maximum discharge capacity Cmax of the alloy electrode increased from 346.4 mAh/g to 378.0 mAh/g, the capacity retention rate S50 was improved from 69.5% to 74.3%, the exchange current density was improved from 122.3 mA/g to 188.5 mA/g, the limiting current density was improved from 891.7 mA/g to 1162.1 mA/g, the corrosion potential was improved from -0.895V to -0.849V, electrochemical reaction impedance was reduced.