The invention relates to a processing method of peach-aldehyde wastewater, which relates to the processing method of wastewater generated in the preparation and production process of peach aldehyde. The processing method comprises the following steps of: using the wastewater generated in the production process of the peach aldehyde as an electrolyte, wrapping a graphite sheet and a stainless-steel sheet by utilizing activated-carbon fiber cloth in a winding or unwinding way to manufacture an electrolysis electrode, bubbling through a bubbler for oxygen supply, and carrying out electro-oxidation processing under the action of direct current. By the processing method, the wastewater with a high COD (Chemical Oxygen Demand) value and many organic-matter kinds generated in the production process of the peach aldehyde can be continuously processed, and the processing method has the characteristics that the processing time is short, the processing effect is good, and the processing efficiency is high; the process is simple, the processing method is simple to operate, the energy consumption is low, and the processing cost is low; and carbon emission is reduced, the processing method is favorable to environmental protection and is convenient in industrialized popularization and application, and the like. The processing method can be widely applied to the processing of organic wastewater in industrial production and is particularly applicable to the wastewater processing in the production process of the peach aldehyde.