Abstract: Taking the STM32F103C8T6 microcontroller as the main control chip, combined with multi-type meteorological sensor acquisition module, OLED display module, WIFI wireless communication module, sound and light alarm module and key module, a meteorological monitoring system based on the Internet of Things was designed. The system collects meteorological data such as temperature and humidity, dust concentration, light intensity, air pressure, wind speed and raindrops in real time through sensors, and after processing by the microcontroller, it realizes OLED local display, sound and light alarm when the threshold is exceeded, and uploads the data to the cloud platform through the WIFI module to realize remote real-time monitoring. Keil was used to complete program writing and debugging, Proteus was used for circuit simulation verification, and after hardware welding and multi-scene actual measurement, the system can accurately collect meteorological data, stably realize all preset functions, and has the characteristics of low cost, high integration and strong real-time performance, which can meet the meteorological monitoring needs of multiple scenarios.