Abstract：In order to realize the coal mine central control system for underground key parameters such as realtime monitoring of gas concentration, temperature, humidity, dust, smoke, and effectively improve the coal mining safety, the underground working environment, a portable multi-parameter monitoring system based on STM32 microcontroller is designed and implemented.The system is designed by using modular design and STM32 micro controller as the core, sensor with MQ4, MQ-2, DHT11, ZPH01.As a parameter acquisition tool, and the system can the acquisition, processing, displaying and warning of the key parameters of the coal mine, and the real-time communication with the central control system, so that it can deal with the emergency.The results of experiment show that the system has the merit of high acquisition, stable and easy to carry, which is suitable for the underground application.

Keyword：STM32;underground key parameter acquisition;early warning;wireless communication;