Adopting the digital technology to promote the interpretation of cultural heritage value and taking Beijing Central Axis as an example, the work aims to put forward the method of mining and interpreting the heritage value based on artificial intelligence knowledge map. The seven-step knowledge map method of using artificial intelligence to interpret the heritage art value was constructed, covering:1) multi-source and heterogeneous art data collation and digital transformation; 2) ontology system based on Protégé; 3) clarification of logical relationship by the mapping between ontology and map database; 4) text mining and extraction based on NLP big data technology; 5) construction of digital resources based on Neo4j; 6) research on refining art value based on Cypher language query and graph algorithm; and 7) visual presentation of knowledge map. Jumping out of the traditional central axis palace art category, the work puts forward four aesthetic dimensions, and reveals the essence of Chinese traditional thought carried by the central axis from four dimensions.