With the rapid development of the information industry, the Internet of Things (IoT) technology has become an important component of the modern construction field, especially in the security protection of intelligent buildings. Intelligent buildings combine automation equipment, communication technology, and automatic control technology to achieve comprehensive intelligent management and security protection, and IoT technology plays a key role in this process. In practical applications, IoT technology has significantly improved the security protection efficiency of smart buildings. By combining network communication, embedded computing, and automation technology, it not only optimizes management, but also changes the functional use of traditional buildings through technology, ensuring the safety of buildings and assets, while improving the comfort and convenience of living environments. In the future, with the advancement of technology, Internet of Things technology will play an increasingly important role in intelligent building security systems, promoting intelligent buildings as the main development trend in the field of architecture.