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Aiming at the difficulty in obtaining environmental parameters in dairy cattle breeding, this paper proposes and implements a dairy cattle breeding environment monitoring system based on Bluetooth and B/S architecture. In order to reduce the cost of cross-platform deployment, the overall system adopts the B/S architecture and introduces a Bootstrap responsive layout; in order to improve the human–computer interaction capabilities, the Echarts graphical plug-in is introduced; and in order to enhance the stability of Bluetooth communication, a time-sharing connection mechanism and sampling are designed along with a cycle adaptive adjustment mechanism. The experimental results show that the system has a good user experience on various smart terminal devices. The time-sharing connection mechanism solves the repeated disconnection problem under the Bluetooth one-master, multiple-slave star connection. The system can be used in the dairy cow growth environment. With real-time monitoring and accurate early warning, it reduces the deployment and use cost of the system and has broad application prospects.