Plant water storage bottom-irrigation system

The utility model discloses a plant water storage bottom-irrigation system which comprises planting pits. A layer of anti-seepage membrane is arranged on the inner wall of the bottom of each planting pit, water storage covers are arranged inside the planting pits, water seepage layers are reserved in gaps between the planting pits and the water storage covers, planting soil layers are arranged above the water seepage layers, water collection membranes are arranged on the surfaces of the planting soil layers, the water collection membranes are provided with through holes for plant trunks to penetrate, and mulch layers are arranged above the water collection membranes. Evaporation of water in the planting pits is slow, water can be supplemented by rainfall or an automatic water supplementing device, water can be provided for plants in case that little rainfall causes water shortage to the plants, and accordingly growth requirements of the plants are guaranteed, survival rate of the plants is increased, maintenance cost is economized and manpower and material resources are economized.