The invention provides an automatic docking device for hold section parts. The automatic docking device comprises a six-degree-of-freedom adjustment platform, a docking measurement platform, a dockingcontrol platform, a docking host computer monitoring platform and the like. The six-degree-of-freedom adjustment platform includes six-degree-of-freedom brackets, five-degree-of-freedom brackets, anda chassis, and the docking measurement platform includes a bracket, a rack, a linear guide, industrial cameras, a laser displacement sensor and a cantilever beam. The docking host computer monitoringplatform has the function of storing and recording docking data parameters and quality characteristic analytical data. The automatic docking device for the hold section parts is mainly used for on-line measurement of automatic docking and mass and centroid of different hold section parts and forming a new mode of hold section assembly with features of precise docking, real-time data visualizationand process online control, the assembly efficiency is improved, the assembly labor is reduced, and finally the aerospace manufacturing industry is further promoted to enhance the core competitiveness.