The invention provides a low-cost high-efficiency machining method capable of machining symmetric multi-node micro-nano metal cone structures. According to the method, the core experiment principle is electricity chemistry corrosion. Under precise control of a precision displacement table, the corrosion time of each portion is controlled and is from long to short, corrosion is carried out from deep to shallow, and finally linear and non-linear metal cones with the tip end transverse radius within one micrometer are obtained. The electricity chemistry corrosion method is applied, in the aspect of micro-nano structure machining, the beneficial effects of extremely low cost and extremely high manufacturing efficiency are achieved, the method can be used for manufacturing probes in scanning near field microscopes and atomic force microscopes, and the manufactured low-cost metal robes has the very high utilization value in the aspects of single molecular imaging, thermally assisted magnetic recording, nano sensing, nano imaging, nano photoetching, nano manipulation and the like.