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In order to monitoring the environment where lack of regulators to detect the parameter all the time, an environment monitoring system is designed based on STM32. The overall design of monitoring system and hardware-software design have been introduced. Both Signal acquisition terminal and main monitor system are using STM32 as the core; the application software of main system is developed by VB. By means of RS485 communication between them and the main monitor system get the data, which is used to compare with the set value. The experiment results show that the measuring error is less than 3% and can stable and reliable work all the time. What’s more, cost-effective, real-time and low power is the system’s advantages. Effectively solve the problem of environmental monitoring.