The invention discloses a three-dimensional process data integration method. The method comprises: constructing an assembly process tree containing various assembly processes; analyzing the assembly process tree, generating an XML file describing a PBOM structure and a node attribute, namely, a PBOM-XML file, and generating a three-dimensional process data index file; a PDM system reading the PBOM-XML file and generating a PBOM view in combination with an EBOM view; and the PDM system associating a PBOM node with three-dimensional process data in a manner of the three-dimensional process data index file. According to the method, a three-dimensional process model, a lightweight three-dimensional process model and the three-dimensional process data such as structural process data and document data are organically integrated through the three-dimensional process index file, so that the three-dimensional process with an inherent correlation relationship and a constraint relationship can be managed through the PBOM node and the consistency and effectiveness of various three-dimensional process data are ensured. At the same time, the method can be used for information software developers to develop three-dimensional process design systems and integrated applications of the three-dimensional process design systems and PDM systems.