In order to solve the technical problems of accurate positioning and low efficiency of truss station expansion and conversion control in the process of on orbit construction of one-dimensional truss,by using the combination of digital twinning and artificial intelligence and the computer modeling technology,a digital assembly system integrating automatic assembly,handling,detection and information tracing was constructed and completed.The results show that compared with the traditional process,the digital assembly system based on DenseNet algorithm has remarkable effects in improving the fault detection rate of truss materials and space utilization,reducing matching errors,realizing real-time tracing in the whole life cycle,speeding up the action beat and so on.The research results provide reference for Chinas aerospace manufacturing enterprises and equipment manufacturing industry to carry out the construction of product digital production line for intelligent manufacturing.