Low-carbon economy is the future development direction. Facing the current situation of high pollution and high energy consumption, low-carbon audit emerges as The Times require. Firstly, the connotation of low carbon economy, green economy and circular economy is analyzed, and the relation and difference among them are pointed out. Based on the low-carbon economy, the article elaborated on the meaning and significance of low-carbon audit. The article uses the analytic hierarchy process to

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... ruct a low-carbon audit evaluation index system. The indicator system includes four indicators of low-carbon environment, low-carbon economy, low-carbon energy and carbon dioxide benefits. The Saaty 1 -9 scale method is used when calculating the criterion layer, index layer and comprehensive weight. The efficiency coefficient method is used in the standardization of indicators in the low-carbon audit evaluation indicator system. On this basis, the standardized scores of each indicator are calculated. The low-carbon economy score of Henan Province was finally calculated. Through the score, we can understand the development of the low-carbon economy in Henan Province. At the end of the article, relevant suggestions are put forward.