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The invention relates to a wood bamboo material corrosion and discoloration prevention triazole composition and a preparation method thereof. The preparation method comprises the following steps: preparing a triazole concentrate comprising 4.1-15.6wt% of a triazole compound, 33.6-67wt% of an ethanol and N,N-dimethyl formamide (DMF) combination, 20.7-26.5wt% of an amine oxide and quaternary ammonium salt combination or a calcium dodecyl benzene sulfonate and fatty alcohol polyoxyethylene ether (MOA-15) combination, and the balance of water, wherein the triazole compound is hexaconazole, cyproconazole, epoxiconazole, triadimenol, or a propiconazole/tebuconazole combination with the ratio of propiconazole/tebuconazole of 1:0.68-0.95; and adding parts of water to the triazole concentrate, adding 5-chloro-2-methyl-1-isothiazoline-3-one/2-methyl-1-isothiazoline-3-one (CMIT-MIT), and diluting the above obtained solution to obtain a triazole composition operating fluid. When the triazole composition operating fluid is used to carry out vacuum pressurizing treatment on a wood bamboo material, the wood bamboo material is dried until the water content of 20-25%, 5-9% low-molecular weight (the molecular weight is smaller than 1000) phenolic resin (PF) is used to carry out secondary vacuum pressurizing treatment, and the two-stage treated wood bamboo material has excellent corrosion, mildew and discoloration resistance and excellent triazole anti-loss performance after being dried.