Titanium matrix composites is a kind of typical hard-to-cut materials, and traditional machining methods have problems such as low machining efficiency and poor machining quality. To this end, experimental investigation on electrochemical drilling of (TiB+TiC)/TC4 composites using a tubular cathode with a diameter of 10mm was conducted. The electrochemical characteristics of (TiB+TiC)/TC4 composites were studied. The polarization curves and current efficiency of (TiB+TiC)/TC4 composites in 10% NaNO₃ solution were measured. The influence of processing voltage and electrolyte pressure on processing accuracy was explored. The results show that when the machining voltage is 30V and the electrolyte pressure is 0.6MPa, the electrochemical drilling process is stably at a feed speed of 1mm/min. When the depth-to-diameter ratio of the machined blind hole is 3.06, the roundness error of the hole is 41.1μm and the taper is 0.4°, which shows the high machining accuracy of the electrochemical drilling method.