Manual assembly is the main method of production in assembly workshop of oil and gas pipeline welding equipment.In order to solve the problems of poor real-time management and low degree of informatization in the workshop,combining digital twin technology and lean manufacturing theory,a digital twin system was designed to improve the degree of intelligent management and control.The overall architecture and functional modules of the system were proposed;the product digital twin and digital twin workshop were constructed,and a management and control method to reduce the influence of uncertain factors was proposed;the working principle of each function was expounded;finally,the operation reliability of the system was verified by taking a certain part of the automatic welding equipment as an example.The experiment results show that the proposed scheme has a significant effect on improving the production efficiency of the welding equipment workshop and realizing the lean production method.