Disclosed is a machining method for electrical sparkles of rarefaction feed nodes in the field of technical field of electrical sparkle machining. A translation curve and a rotation curve of non-interference feed of a tool electrode in a three-dimensional translation space and a rotation space are obtained by decomposing non-interference feed motion of a tool electrode machined part into translation and rotation based on the initial feed starting point. Rarefaction interpolation movement is conducted based on the translation curve and the rotation curve, the feed nodes of all machining stages are obtained, and numerical control codes conforming to the machining movement form of an electrical sparkle machine tool are output with all the feed nodes as the datum. According to the machining method, the cutter lifting frequency can be reduced, the cutter lifting time consumption is reduced, and the feed efficiency of the tool electrode is improved.