The invention relates to an efficient metal corrosion inhibitor, which is prepared from the following raw materials in parts by weight: 15 to 25 parts of sodium tungstate, 40 to 60 parts of ethylene glycol, 7 to 15 parts of ethyl alcohol, 20 to 30 parts of monoethanolamine, 4 to 9 parts of ammonium citrate, 40 to 60 parts of zirconium carbonate, and 250 to 350 parts of water. A preparation method comprises the following steps of adding the water in a glass container, adding the sodium tungstate, and stirring for dissolving; and then sequentially adding the ethylene glycol, the ethyl alcohol, the monoethanolamine, the ammonium citrate and the zirconium carbonate, and stirring for dissolving to obtain the efficient metal corrosion inhibitor provided by the invention. The efficient metal corrosion inhibitor provided by the invention has no need to be water-washed after being used, and can be directly sprayed with oil paint, the oil paint cannot be bubbled or fallen off, and the painting film adhering capacity achieves 0 degree.