Greenhouse irrigation and drainage system with saline-alkali treatment and water and fertilizer cyclic utilization functions

The invention provides a greenhouse irrigation and drainage system with saline-alkali treatment and water and fertilizer cyclic utilization, and relates to the field of greenhouse irrigation and drainage systems, the greenhouse irrigation and drainage system comprises a switching assembly, the switching assembly is composed of a collection mechanism and a control mechanism, the switching assembly can recycle water collected by the collection mechanism for multiple times, the consumption of the water and fertilizer is greatly reduced, and the utilization rate of the water and fertilizer is increased; meanwhile, the switching assembly has a double-channel mode, the effects of collecting water, cleaning and collecting water permeable holes of concealed pipes, supplying oxygen to plant roots and providing external filter layers can be achieved through switching between channels, the functions are powerful, the system is suitable for greenhouse planting, and the problem that when an existing greenhouse irrigation