The invention discloses an intercropping method of polygonatum cyrtonema and alder. The intercropping method comprises the steps of planting alder in flat land or gentle-slope land to form an alder forest; planting the polygonatum cyrtonema among each row of alder in the alder forest to form planting blocks of the polygonatum cyrtonema, wherein ditches are arranged among each row of alder and the planting blocks of the polygonatum cyrtonema, and the distance between the ditches and each row of alder is 55-65 cm. According to the intercropping method of the polygonatum cyrtonema and alder, efficient utilization of a forest land resource is achieved, and the planting paths of the polygonatum cyrtonema are added.