Abstract: The system uses STM32 single chip microcomputer as the main control chip to monitor the temperature, humidity, illumination, hydrogen sulfide concentration, carbon monoxide concentration, ammonia concentration and smoke concentration in real time, and upload them to the cloud platform. If the specified threshold is exceeded, an alarm will be sent, and the alarm information will also be uploaded to the cloud platform. The data curve and alarm records can be viewed at any time through the mobile terminal,and the user can remotely control the equipment according to the actual monitoring situation. Applying 5G technology to pig farms can realize long-distance data transmission and equipment control, effectively solve the problem of no one on-site monitoring in time, and has certain economic benefits and development prospects.