Abstract: Tractor is an important power machinery in agricultural production, and the automatic driving system of tractor is an important part of the realization of precision agriculture.Facing the changeable working terrain in China, the in-depth study of working path and field turning path planning is particularly important.In order to improve the intelligence and accuracy of the auto drive system of agricultural machinery, and further improve the efficiency of agricultural machinery operation, this paper studies a path planning system, which outputs a scientific and reasonable path planning according to the situation of the input land, the requirements of agricultural machinery parameters and operation technology.