Abstract: Using auxiliary navigation control spray to carry out automatic spray operation can improve spray efficiency and pesticide utilization, reduce environmental pollution and protect personal health and safety. Especially in the new era of rapid popularization of digital and intelligent technology, composite navigation technology can be combined with automatic control technology and become the key technology to assist the intelligent operation of spray. Based on this, by analyzing the functional requirements of the garden environment for the auxiliary navigation system, the key points and difficulties of the navigation system design were sorted out, the main function diagram of the auxiliary navigation control system was established, and the composite navigation environment perception system was established by using BDS differential positioning, visual positioning, laser ranging, millimeter wave radar and other technical means, to achieve navigation decision-making under the raspberry pie processing unit and PID control mode, Through the tests of CP group, SM group and SQ group in the campus garden environment, the auxiliary navigation control system has been proved to have high path driving accuracy and obstacle avoidance accuracy, but it still needs to be improved in local details.