The invention brand-new proposes a patent knowledge graph construction method based on an object agent database, and the method comprises the steps: firstly achieving the storage of basic classes through employing a source class in an object agent, and then completing the modeling of a relation class through employing four agent classes. On the basis, the construction of the query is realized by utilizing the cross-class query statement. Compared with a current knowledge graph mode, the multi-level semantic association can be better expressed, the connection operation of the data table is reduced, and the query efficiency is improved.