NOVELTY - Preparing chromatogram pure acetonitrile, involves: passing the industrial acetonitrile with content of not less than 98 wt.% through the treatment column filled with organic amine supported catalyst, under conditions of high-purity nitrogen at room temperature and pressure of 0.1-0.15 MPa; and passing through the treatment column of 4A molecular sieve under the same condition to prepare the chromatogram pure acetonitrile, where the organic amine catalyst deactivated can be activated by saturated sodium carbonate solution.    USE - For preparing chromatogram pure acetonitrile (claimed) used as raw material for organic synthesis, medicine, pesticide, surface active agent, dye and as fine chemical synthesis raw material.    ADVANTAGE - The organic amine catalyst deactivated can be activated by saturated sodium carbonate solution, and it can be recycled and used, which greatly reduces the environment pollution. The method overcomes the problems of the prior art of large energy consumption, complex operation, which is good for energy saving and emission reduction. The method is low production cost and suitable for industrial production.    DETAILED DESCRIPTION - Preparing chromatogram pure acetonitrile, involves: passing the industrial acetonitrile with content of not less than 98 wt.% through the treatment column filled with organic amine supported catalyst, under conditions of high-purity nitrogen at room temperature and pressure of 0.1-0.15 MPa; and passing through the treatment column of 4A molecular sieve under the same condition to prepare the chromatogram pure acetonitrile, where the organic amine catalyst deactivated can be activated by saturated sodium carbonate solution. The preparation method of organic amine catalyst involves: adding the tert. butyldimethyltert. aminosilane, ethylamine into anhydrous toluene solvent, under the stirring and heating to reflux temperature of 110.6 degrees C, and refluxing for 2-3 hours, adding solid carrier i.e. silicon oxide under the reflux, keeping refluxing for 4-6 hours, cooling, filtering, drying the obtained solid to obtain the solid organic amine catalyst. The mass ratio of the tert. butyldimethyltert. aminosilane and ethylamine is 1: 0.2-0.4. The mass ratio of the tert. butyldimethyltert. aminosilane and silicon oxide is 1: 3-5. The mass-to-volume ratio of organic amine catalyst with industrial acetonitrile is 10-50. The weight-to-volume ratio of the 4A molecular sieve with the industrial acetonitrile is 1: 10-50. The activating process of organic amine solid catalyst deactivation involves: reacting the deactivated solid organic amine catalyst and saturated sodium carbonate solution at room temperature, stirring for 1-2 hour, the solid obtained by filtering and drying to obtain the organic amine supported catalyst activation. The weight-to-volume ratio of the organic amine supported catalyst and saturated sodium carbonate of the inactivating is 1:5-6.