Tungsten has a series of excellent physical and chemical properties, which can meet the performance requirements of aerospace materials, and has been widely used in some key components of satellite, aircraft, aero-engine and other equipment. When traditional machining techniques are used to manufacture parts, the process is usually limited by heating at the interface between the part and the tool, elastic and plastic deformation, high tool wear rates, and changes in the material properties of the workpiece. The electric discharge machining (EDM) technology is one of the most effective machining technologies for conductive materials, but the reliability and efficiency of the existing EDM technology can not meet the machining requirements for the manufacture of tungsten small holes. A method of machining tungsten small holes in salt solution with certain conductivity by electrospark-electrolytic hybrid energy field is proposed. The mechanism of material removal during machining is analyzed. This method uses electrolytic action to generate hydrogen and form gas film at the tool electrical extremity, which promotes the rapid formation of plasma discharge channels between the two poles. The process optimization experiment was carried out to analyze the influence of different parameters on the machining characteristics. NaNO₃ electrolyte with pulse width of 3 μs, pulse gap of 12 μs, peak current of 14.17 A and working liquid concentration of 18 g/L was used to obtain high efficiency and high quality tungsten holes.