The invention discloses a saline and alkaline land stereoscopic cultivation device which comprises a supporting frame with a trapezoidal frame structure and planting areas, wherein the planting areasare fixedly mounted on two sides along two sides of the supporting frame in a layered manner. A water storage area is welded on the supporting frame and positioned between the two planting areas, water outlets in two side walls of the water storage area are positioned at the tops of the two planting areas, the bottom of the supporting frame is fixedly placed into a liquid storage groove, saline and alkaline soil is stored in the planting areas, discharging pipes are arranged at the bottoms of the planting areas, the discharging pipes positioned on the same side of the supporting frame are serially connected and collected into the liquid storage groove, and water in the discharging pipes on the upper layer cannot flow the planting area of the lower layer. The stereoscopic cultivation devicehas a perfect drainage and irrigation system and is mainly applicable to stereoscopic cultivation of saline and alkaline lands, irrigating and discharging can be separated, the content of salt in soil can be remarkably reduced, the quality of the soil can be improved, the utilization efficiency of water can be improved, the survival rate of crops can be increased, and the yield of the crops can be improved.