Aiming at the difficult configuration and planning scheduling of the machining production line of spacecraft structural parts, as well as the high overall occupancy rate, low utilization rate and limited capacity improvement  of the production line, a digital twin based on the reconstruction of the production line of spacecraft structure products and adaptive scheduling method is proposed. Based on the operation mechanism of “visual monitoring based on digital twin + rapid reconstruction of production line + adaptive scheduling of real-time perception”, the three key implementation technologies of the above method, namely 3D visual monitoring based on digital twin, rapid reconstruction of production line driven by task and workshop operation status data and adaptive scheduling based on reconstructed production line and real-time perception data, are elaborated. Design and develop a virtual dynamic reconstruction system for intelligent workshops based on digital twins to verify the effectiveness of the method.