For the purpose of studying the smart classroom in the digital construction of schools, based on the Internet of Things technology and cloud computing technology, the smart classroom is designed in accordance with the architecture system of the perception layer, the network layer and the application layer. The composition of the three-layer architecture and the design content of the physical environment and the software environment are specifically analyzed. Research shows that the intelligent classroom based on threelayer architecture with ZigBee technology can realize unified intelligent management and control of classroom electrical equipment, teaching resources, etc. Software system development using cloud computing technology can more efficiently and safely use classroom resources and provide high-quality classroom environment for teachers and students, which has extensive application value.