Preparation method of trimethyl orthoformate

Disclosed are high-quality trimethyl orthoformate and a preparation method of the trimethyl orthoformate. The preparation method of the trimethyl orthoformate comprises the steps of obtaining amine salt by reaction between hydrocyanic acid and carbinol and hydrogen chloride and obtaining a trimethyl orthoformate coarse product through alcoholysis; and carrying out centrifugal separation on alcoholysis reaction liquid, and refining the obtained coarse product by adding aqueous alkali. The purity of the trimethyl orthoformate product obtained with the refining method can reach to 99.6%-99.8wt%, triazine impurity content is pretty small and is only 0.001-0.06%, and particularly purification yield of the refining method is more than 90% and can reach to 96% to the maximum degree. According to the trimethyl orthoformate and the preparation method of the trimethyl orthoformate, treating agents can be obtained easily, cost is low, reaction condition is moderate, and the trimethyl orthoformate and the preparation method of the trimethyl orthoformate are particularly suitable for industrial mass production.