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Abstract：The automatic navigation driving technology of intelligent agricultural machinery has become a research hotspot in the current research of precision agriculture. During the course of engineering, the technicians are faced with the dilemma of upgrading software modules frequently. As a result, decentralized design limits the application of this technology. In this paper, a centralized ECU design architecture is proposed to integrate the key technologies involved in the automatic navigation driving system, such as integrated navigation, path adaptive tracking control, and human-computer interaction. The field test shows, compared with the traditional discrete module system, the complexity of the system is reduced, and the reliability and integration are greatly improved under the output constraint of 2.5cm operation accuracy.