Natural gas combustion-supporting additive as well as preparation method and application thereof

The invention relates to a natural gas combustion-supporting additive and a preparation method and application thereof, and belongs to the technical field of metal cutting. The additive comprises the following components in percentage by mass: 3 to 27.5 percent of methyl tert-butyl ether, 5 to 40 percent of acetone, 5 to 15 percent of butanone, 3 to 10 percent of methyl ethyl ketone, 10 to 25 percent of methanol, 10 to 36 percent of cyclopentane, 1 to 2.5 percent of ferrocene and 2 to 5 percent of nitro isooctyl ester, wherein the total mass of the additive is 100 percent. The additive can remarkably improve the combustion temperature and the combustion speed of natural gas, and pipeline valves are not prone to being corroded or blocked; the natural gas metal cutting gas obtained by injecting the natural gas combustion-supporting additive into natural gas is small in cutting flame, stable in flame frequency and wavelength, fast in preheating and high in cutting amount quality, can effectively replace acetylen