Electric spark machining device and electric spark machining tool based on motion arc

The invention discloses an electric spark machining device and electric spark machining tool based on a motion arc. The electric spark machining device comprises a rotating electrode unit, an electricenergy conveying unit, a liquid flushing unit and a spindle cooling unit, wherein the rotating electrode unit includes a rotating driving mechanism, a hollow spindle, a hollow connecting shaft and atubular electrode, the hollow spindle, the hollow connecting shaft and the tubular electrode are connected in sequence, the interiors of the hollow spindle, the hollow connecting shaft and the tubularelectrode form a medium channel, and the rotating driving mechanism is mounted on the hollow spindle of a spindle mounting seat in a driving mode; the electric energy conveying unit includes a directcurrent power supply, a protective resistor and a conductive sliding ring, the conductive sliding ring is arranged outside the hollow spindle in a sleeving mode, a cathode of the direct current powersupply is connected with the conductive sliding ring, and a positive electrode is connected with a workpiece through the protective resistor; the liquid flushing unit communicates with the hollow spindle through a rotating joint; and the spindle cooling unit communicates with a cooling cavity in the spindle mounting seat. The electric spark machining device can be applied to the field of electricspark machining, the stable arc of high-speed motion can be formed between the tubular electrode and the workpiece, and the motion arc can conduct high efficiency corrosion removing on the workpiece.