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High temperature electrochemical synthesis of tungsten boride has been performed in KF-KCl melts with B₂O₃ and WO₃ used as reactants at 1033K. The cathode product was investigated in the current density range 0.4A/cm²-0.6A/cm² and characterized by means of XRD analyses and SEM. The results indicated that cathode product is mainly consist of W₂B₅ and WB₄, the powders are fine (<0.5um). Current density exert a great effect on the phase composition, particle size and morphology of the cathode product.