The invention discloses a bunched electrode high-speed discharge processing method in the technical field of arc discharge processing. A bunched electrode is fixedly connected with a spindle of a machine tool, the end surface of the bunched electrode faces to a workpiece to be processed on an operating platform of the machine tool, and the workpiece can be immersed in a water-based operating fluid provided by a water-based operating fluid supply system; then a fluid loop is formed by the water-based operating fluid supply system, the bunched electrode and a machine tool operating fluid trough, and a current loop is formed by a discharge source, the bunched electrode, the interelectrode broken-down water-based operating fluid and the workpiece to be processed; the water-based operating fluid between the bunched electrode and the workpiece to be processed is circulated through the water-based operating fluid supply system; the bunched electrode is connected with the negative electrode of the discharge source, the workpiece to be processed is connected with the positive electrode of the discharge source, and direct current or pulse current is applied by the discharge source to form short arc discharge, so that the high-speed discharge processing is realized. The invention realizes strengthened high pressure and large flow fluid filling in multiple holes by utilizing the bunched electrode, ensures short arc discharge processing by applying a fluid hydrodynamic force arc-breaking mechanism and is a method capable of simply, conveniently and economically realizing the high-speed discharge processing of the bunched electrode, particularly the processing of curves and mold cavities.