Presently, the adoption of Internet of things(IOT)-related technologies in the Smart Farming domain is rapidly emerging. The increasing number of sensors used in diverse applications has provided a massive number of continuous, unbounded, rapid data and requires the management of distinct protocols, interfaces and intermittent connections. A low-cost, low-power, and low data-rate solution is proposed to fulfill the requirements of information monitoring for actual large-scale agricultural farms, which we will need pressingly in the future. This paper designs a heterogeneous data acquisition and control system for differentiated agricultural information monitoring terminal. Based on the IoT-CAN bus architecture, the system can adapt different sensors and actuators, realize information exchange, and facilitate modular splicing deployment. At the same time, the heterogeneous network data interface is standardized, and the analytical storage of heterogeneous data is standardized. Lastly, it verifies that IoT-CAN protocol architecture is better than RoboCAN and CANOpen, and systems in agricultural environment. It solves the problems of hardware difference and heterogeneous data in monitoring system, which is of great significance to the establishment of heterogeneous data standard of agricultural information.