The invention relates to a technique of ginseng planting, in particular to a method for planting ginseng on a farmland, which includes: land selection, soil improvement, bed making, seed sprouting, seeding, transplanting, shed erection, field management, overwintering cold protection, and ginseng root harvesting. By improving and regulating relevant technical steps and parameters in ginseng planting, the method is more reasonable and highly operable, regulated planting is achieved, farmland soil quality is improved, the requirements of ginseng cultivation are met, ginseng quality is guaranteed, and popularization of ginseng planting on farmlands is benefited. The sprouting is achieved by the sand and water process, seed opening rate reaches more than 90%, and germination rate is increased. Annual ginseng seedlings are used for transplanting, the transplanted seedlings continue growing for 4-5 years on the same farmland, and accordingly land resources are saved, ginseng growth and double-tuber ginseng formation are benefited, photosynthetic area is enlarged, and ginseng quality and yield are increased.