Nutrient solution for fresh water bangia

The invention relates to a nutrient solution which is suitable for growth of fresh water bangia, is prepared for solving the problem that the fresh water bangia is difficult to culture, is capable of being preserved in a long term indoor and overcomes the defects in the prior art. The solution comprises 0.2-0.34 mg/ml of CaCO3 and 0.14-0.27 mg/ml of MgCl2, and comprises, by volume ratio, 10-15 percent of sea water and 8-12 percent of nori extract. The nutrient solution is different from the nutrient solution of general higher plants and alga and is a typical alkaline nutrient solution, the content of Ca/Mg ions is quite high, and the pH value is 7.9-8.2. The nutrient solution is easy to prepare while nutritional ingredients are quite rich, and the nutrient solution is different form existing alga nutrient solutions such as f/2, PES and MES which are quite complex in preparation and single in nutritional gradient. Furthermore, rich mineral ions, amino acid and secondary metabolism products such as vitamins and plant hormones needed by growth of plants are contained in the formula of the nutrient solution, and sufficient nutrition is provided for growth of the bangia.