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.