Cotton water culture device

The utility model relates to a cotton water culture device which comprises a seedling outlet sub-device, a cotton seedling culture sub-device and an upper cover provided with a first set number of cotton seedling holes. The seedling emergence sub-device comprises a base and nutrient soil; the base is of a concave structure, and nutrient soil is placed in a groove of the base. The cotton seedling cultivation sub-device comprises a cultivation box filled with a nutrient solution; the upper cover is placed above the base and completely covers the base; the base is used for cultivating cotton seeds into cotton seedlings, a first set number of cotton seeds are placed in the nutrient soil, the cotton seed placing positions correspond to the cotton seedling holes in the upper cover, and it is guaranteed that the cotton seedlings penetrate through the cotton seedling holes to grow; the upper cover with cotton seedlings is placed above the cultivation box and completely covers the cultivation box; the liquid level of