To provide some reference for the application of infrared thermal imagers in the safety inspection of building envelope systems, this paper uses literature review and case analysis methods to discuss the basic principles of infrared thermal imagers, taking Building B2 of the Agricultural Science Academy Area in the Yuelu Mountain Laboratory Cluster as an example, explore the advantages of infrared thermal imagers in the safety inspection of building envelope systems, and analyze the application and impact of infrared thermal imagers in the safety inspection of near zero energy building envelope systems. It can be concluded that infrared thermal imagers have advantages such as non-contact detection, accuracy, real-time performance, and environmental adaptability in the safety inspection of building envelope systems. They can be effectively applied in building leakage detection, building exterior wall decoration quality inspection, building moisture intrusion detection, and building thermal defect detection.