The invention discloses a method for planting artificial grassland in a subalpine arid area. The method includes the steps of stripping primary surface soil in the subalpine arid area, taking the soil as backfill surface soil, and placing a gravel layer in the backfill surface soil; sowing grass seeds according to convention, applying compound fertilizers as a base fertilizer, covering the primary surface soil, ensuring sufficient contact between the seeds and the soil, watering until the seeds emerge, and completing the planting of the artificial grassland in the subalpine arid area. The method increases the moisture permeability of the soil, prevents soil moisture from diffusing outwards, reduces moisture loss of the surface soil, and can conduct the storage and preservation of the soil moisture by increasing moisture infiltration capacity and inhibiting moisture evaporation, thereby promoting the growth of plants. After the method is implemented, no watering is needed when the seeds emerge. The method can be widely applied in the process of planting the artificial grassland in the subalpine arid area, and plays an important role in improving the ecological environment in high mountain areas of Western China. The method has the advantages of simplicity, low costs and easy popularization.