To solve the issue of poor air quality in high-density classrooms, which leads to low learning efficiency and hurts the physical health, we design an integrated perception system. First of all, this paper elaborates the overall design of the integrated classroom air perception system. Secondly, the hardware circuits of indoor and outdoor data acquisition module, main control module, power supply module and liquid crystal display module are designed by modular design approach. Meanwhile, software programs are designed for the corresponding modules. After the software and hardware joint debugging of the system, it can not only display the perceived concentration of PM2.5, PM10, carbon dioxide, formaldehyde, volatile organic compounds, but also has good stability. The system can be applied to the classrooms of school, and has certain application value for making air better.