The invention relates to an electric spark and electrolytic continuous machining method and tool for efficient plane milling, and belongs to the field of electric spark and electrolytic machining. A cathode of the tool is mainly formed by combining a copper-tungsten alloy electric spark electrode and a stainless steel electrolytic electrode. The initial machining gap of the copper-tungsten alloy electric spark electrode and the to-be-machined surface of a workpiece is set to be a small value, when a large voltage is applied, air in the machining gap is subjected to breakdown, generated electric sparks rapidly remove an oxidation layer and a large number of metal bodies on the surface of the alloy workpiece in a corrosion manner, and the time needed for oxidization layer removal in subsequent electrolytic machining is saved; and then materials are further efficiently removed by the electrolytic electrode through the electrolytic function, and the uneven surface subjected to electric spark machining is subjected to electrolytic machining to be level and smooth. Through electric spark and electrolytic continuous machining, titanium alloy materials can be efficiently removed, and the significance on improving the titanium alloy machining efficiency is achieved.