The invention discloses a machining method of a burner spraying head. The machining method of the burner spraying head includes the following steps that firstly, a steel spraying head initial blank isselected, and is subjected to precise grinding; secondly, heat treatment is performed on the spraying head in inert protective gas in a heat treatment furnace; thirdly, the spraying head after heat treatment is placed into a lubricating groove to be subjected to surface lubricating treatment, wherein lubricating liquid is gasoline and engine oil, and 8 wt% of oil-solubility organic copper compounds are contained in the gasoline and engine oil; and fourthly, the spraying head obtained in step 3 is detected, and after qualification, metering and packaging are performed. By performing heat treatment on the spraying head, the metallographic structure of the spraying head can be refined, and the corrosion resistant performance of the spraying head is improved in the aspect of the structure. Meanwhile, by performing surface lubricating on the spraying head and dipping the spraying head in a little amount of copper elements, the compactness and the pollution resistant performance of the surface of the spraying head are improved, the spraying head forms a layer of compact copper oxide layer with a nanometer structure, the corrosion resistant performance of the spraying head is enhanced, and the spraying head is durable.