The invention discloses a method for cultivating vegetables in a water mode through spiral seaweed cultivation waste water. The method includes the following steps: carrying out
processing such as filtering, diluting and pH adjustment on the collected spiral seaweed waste water; comparing the preprocessed spiral seaweed waste water with a standard total
nutrient solution, and adding microelements necessary for
plant growth to obtain a spiral seaweed waste water
nutrient solution; soaking vegetable seeds into a clean culture dish, and placing the culture dish into a constant temperature illumination
incubator till the seeds are sprouted; selecting
sprouted seeds with the good growth conditions according to the
sprouting states of the seeds, and
transplanting the selected seeds into a Hogland type
nutrient solution to cultivate seedlings; when the seedlings are grown to form plants, carrying out spiral seaweed waste water cultivation through plastic thin plates and water grooves; carrying out harvesting or
transplanting. According to the method, the vegetables are cultivated in a water-planted mode through the spiral seaweed cultivation waste water, environment
pollution caused by direct discharging of the spiral seaweed cultivation waste water is reduced, the waste water is changed into wealth, waste of
water resources is reduced, and
resource utilization of the spiral seaweed waste water is sufficiently achieved; meanwhile, the direction problem of the spiral seaweed cultivation waste water is solved, and the
sustainable development of a spiral seaweed enterprise is also facilitated.