The invention relates to a plant stereoscopic planting box which does not need water and electricity and manual irrigating and maintaining and protects environment and saves energy. The invention comprises two large portions like a planting area and a rain water-collecting area. The invention is particularly applied to special facade afforestation such as roof gardens, wall (post) faces and overhead sound-absorbing barriers which are difficult to maintain. The stereoscopic planting box depends on the structural superiority to automatically accumulate water and preserve moisture, and moisture-preserving layers can stop unnecessary vaporization to the largest extent for improving the drought resistance of plants. The invention does not need to irrigate and maintain under normal climatic conditions, and can automatically supply water under bad and draught conditions. The stereoscopic planting box depends on the superiority of exterior design, which is applicable to various shapes. After being installed, the entire planting box is shaded by plants, only plants are exposed on decorative facades to form an integral flower wall (post), the appearance is elegant, and the invention has the performances of quick and convenient dismounting. The stereoscopic planting box depends on the formulation superiority of lightweight nutritious soil, which has lightweight and extensive applying scope, and is particularly applicable to greening of old houses with little bearing.