The invention relates to the technical field of intelligent retrieval, in particular to an
engineering knowledge base construction and deep retrieval method, which comprises the following steps of: in a
knowledge base construction stage, performing
knowledge level identification on an
engineering knowledge document to form a multi-level
tree structure taking chapter titles and corresponding contents as nodes; performing analysis
processing on the heterogeneous content of each node to generate knowledge fragments; and generating embedded vectors of knowledge fragments by adopting a way of combining path embedding and content embedding, and storing association relationships among knowledge, vector data and original information to complete
knowledge base construction. In the deep retrieval stage, after a user question is received, a knowledge blank question
list is generated through query and
rewriting, a knowledge base is retrieved through traversal of the
list, the retrieval process is optimized through knowledge grouping, correlation sorting and loop termination judgment, and finally reply content subjected to traceable
verification is generated and output based on existing knowledge accumulated in a circulation mode. According to the method, the reuse efficiency and the retrieval accuracy of the
engineering knowledge can be improved.