Abstract: In order to realize the wireless remote real-time monitoring of cow temperature, a cow temperature monitoring system based on WiFi and cloud was designed. The main processor and wireless communication module of the system adopted ESP8266; the temperature sensor adopted MLX90614 ESF infrared temperature sensor; the cloud used OneNet internet of things cloud platform, and a wechat applet cow temperature monitoring terminal was developed. The system could monitor the cow’s temperature in real time through web pages; WeChat applets. At the same time, an abnormal cow temperature alarm system was designed. The cloud platform sent alarm information to the preset mailbox. Managers could quickly locate abnormal cows through the alarm information. The results showed that the system ran stably, and the measurement accuracy of cow body temperature reaches ± 0.01 ℃, indicating that the system could realize real-time wireless remote monitoring of cow body temperature.