The utility model relates to a drop irrigation ecological slope protection device which comprises a net rack. The net rack is arranged against a retaining wall or a steep hill. The net rack comprises trusses which are vertically arranged and net rack cross beams which are transversely arranged. The trusses are arranged at intervals in the transverse direction. The net rack cross beams are connected with the trusses and are arranged at intervals in the vertical direction. Ecological bags and plant growing bags are arranged on the bottom layer of the net rack and on each layer of the net rack cross beams in a layering and laminating mode. A drop irrigation pipe is arranged above the ecological bags and the plant growing bags. Drop irrigation holes are formed in the drop irrigation pipe. The drop irrigation pipe is connected with a water pipe. Through utilization of the net rack, the drop irrigation pipe, the ecological bags and the plant growing bags, a stereoscopic planting seedbed is formed. A water supply drop irrigation pipe network is utilized to supply water and fertilizer so as to ensure autonomous water storage and drainage of the planting seedbed. Through utilization of shrub-grass vegetation planted in the ecological bags and the plant growing bags and ecological protective rock slopes or the retaining walls, the drop irrigation ecological slope protection device is reasonable in design, easy to construct, convenient to operate, low in cost, easy to popularize, and capable of being used for ecological protection of the steep and high rock slopes and the retaining walls.