For solving the problems of poor timeliness of product quality control, low efficiency of problem traceability and poor unpredictability in general intelligent manufacturing schemes, a quality control technology based on digital twins is proposed. This paper introduces the application of digital twin technology in product quality control and the key technologies needed for the construction of current digital twin model, and compares the current quality control technology route with the quality control method driven by digital twin. The results show that the high performance, high consistency and reliable assembly can be realized in the process of assembly quality control of complex products by introducing the technology into the assembly quality control of complex products.