Abstract: At this stage， substation construction is an important part of electric power infrastructure， and its quality directly affects the stable operation of the power system. However， as traditional methods for quality control in substation construction have certain limitations， this paper proposed a digital twin-based substation construction quality control method to address these challenges. Firstly， a digital twin model of the substation was constructed by integrating the BIM model with data collected on-site by inspection robots. Secondly， the specifications for construction steps were imported into the digital twin system in advance， creating a system capable of autonomously evaluating the real-time updated digital twin model against these specifications. The model was updated in real time through inspection robots that collected on-site construction conditions continuously or at specified time intervals， enabling real-time monitoring， quality assessment， and predictive maintenance during the construction process. This paper detailsed the principles of digital twin technology， the model construction method， and its application in quality control for substation construction. The effectiveness of the method was demonstrated through case studies.