One-way drain valve and composite ecological geomembrane formed by same

The invention belongs to the technical field of one-way drain valves, and particularly relates to a one-way drain valve and a composite ecological geomembrane formed by the one-way drain valve. According to the main technical scheme, the device is composed of an ecological geomembrane and one-way drainage valves sequentially arranged in the ecological geomembrane; the one-way drain valve is composed of a water inlet cylinder, an outer cylinder mechanism provided with a drain hole, an arch-shaped protective cover mechanism and an elastic sealing plug mechanism. The ecological geomembrane comprises a lower permeable geotextile layer, a geomembrane layer and an upper permeable geotextile layer; the one-way drain valve penetrates through the geomembrane layer fixing hole to be clamped between the lower water-permeable geotextile layer and the upper water-permeable geotextile layer. The one-way drain valve of the structure has the advantage of being simple in structure, the composite ecological geomembrane formed