Aiming at the great hardship and low efficiency of deburring on the inner intersecting holes, using electrolytic machining theory and applying fixed inserting cathode pole layout, an automatic electrolytic deburring method based on detection of electric current is proposed, and a mathematic model is set up. Simulation and experiment are adopted to find out the effect of gab, voltage and time in the electrolytic deburring process. The result shows that the electric current density changes over time. Under the present pole layout condition, the average electric current goes down and the slope nearly reaches zero when deburring is completed. Taking this as the judgement of end of deburring, an automatic electrolysis deburring control system is developed. The experiment shows that the method can control the machining time according to the size of burr and remove it accurately. Besides the method has low cost and high quality.