In order to solve the problem of safety accidents, such as the overturning of the traction walking plate and the jumping of subconductors, during the construction process of transmission line tension framing, because the construction personnel cannot fully monitor the key state quantities of the traction walking plate, a multi-parameter intelligent monitoring system for the traction walking plate based on the digital twin technology is developed. In the selection of twin data, based on the analysis of the risk points of the traction walking plate, the subconductor tension, tilt angle and spatial position of the traction walking plate are selected as the twin data. For the mapping of the twin data, the grid information model (GIM) and building information model (BIM) are used as the basis to establish a refined engineering structure model, which accurately reflects the geometry and mechanical properties of the traction slab. Finally, the connection design of twin data, hardware design, equipment data layer design and twin service type are designed in 3 parts, and the improved isolated forest algorithm is adopted as the twin service layer of the monitoring system.