The invention discloses an electrolytic machining device. The electrolytic machining device comprises an electrolytic liquid bath, a circulation pipe, a machining power and a worktable, and further comprises an electrolytic cathode and a torsional vibration device; a nozzle of the electrolytic cathode is connected with a cathode of the machining power; the anode of the machining power is connectedwith a workpiece; the nozzle of the electrolytic cathode communicates with the electrolytic liquid bath through the circulation pipe; and the torsion vibration device is used for controlling the electrolytic cathode to generate reciprocated torsion vibration. According to the electrolytic machining device provided by the invention, the electrolytic cathode can perform high-frequency reciprocatedtorsion vibration at a certain torsion angle through the arrangement of the torsion vibration device; side wall remaining materials on the surface of the workpiece are removed in real time through a method of high-frequency vibration of the nozzle of the electrolytic cathode; compared with the prior art, the technique has the advantages that residual of the side wall remaining materials is avoided; meanwhile, an agitation effect can be exerted on nearby flow fields, so that machining clearance flow fields can be homogenized; generation of vortex zones and flow rate dead zones is eradicated; and machining efficiency is improved.