Cu-based TiB2/Cu electrodes reinforced by conductive ceramic TiB2 particles with a particle size of about 3 mm were prepared by electroforming in acid H2SO4 solution. Their structure was observed by scanning electron microscopy and metallographic microscope, hardness was measured by Vickers hardness tester, the corrosion resistance was measured by salt spray tests, and the electric erosion resistance was evaluated by brittle-hard materials. The results show that the reinforcing TiB2 particles are uniformly distributed in the matrix. The particle size of the electroformed Cu and TiB2/Cu is 30 and 10 mm, the hardness is 984 and 1235 MPa, and the corrosion is 47.8 and 40.3 mg, respectively. Compared with Cu electricity deposit, TiB2/Cu composites have preferable surface, small grains and higher hardness, and this kind of composite material as an EDM tool electrode material show good corrosion resistance and electrical erosion resistance.