Preparation method of 1,3,6-hexanetricarbonitrile

The invention relates to a preparation method of 1,3,6-hexanetricarbonitrile. The preparation method comprises the following sequential steps: a, preparation of 1-amino-2-cyano-1-cyclopentene; b, preparation of a crude product; and c, purification of the crude product. The preparation method of 1,3,6-hexanetricarbonitrile overcomes the safety problem of the preparation of 1,3,6-hexanetricarbonitrile in the presence of sodium, and therefore the preparation process is safer and the requirement for large-scale industrial production is also met. Besides, the preparation method of 1,3,6-hexanetricarbonitrile also has the advantage that the yield is high and the prepared product has the characteristics of high purity, low chroma, high quality and the like.