Aiming at the problems of low land utilization rate,low efficiency of agricultural machinery,high labor intensity of drivers and serious mechanization loss in the process of agricultural machinery operation at present,an agricultural machinery automatic navigation assistant driving system based on Linux+STM8 is designed.The system automatically controls the agricultural machinery through the dual antenna positioning and orientation module,data acquisition module,control module,motor drive module and graphical operation interface,so as to liberate the labor force and improve the land utilization rate.The experiment results show that the system can provide high-precision navigation during agricultural machinery operation,realize automatic driving,control the operation error to about ±2.5 cm,improve the land utilization rate,and reduce the loss of mechanization.