The present invention relates to the field of soilless cultivation, in particular to a method for cultivating Mesembryanthemum crystallinum. The method involves the following steps: sowing; accelerating germination; growing seedlings; transplanting; separating seedlings; harvesting. In this method, Mesembryanthemum crystallinum is cultivated using a nutrient solution and under continuous indoor lighting; as a result, the Mesembryanthemum crystallinum has a shortened life cycle, no flowering period, and a long harvesting period. Edible salt is added to the nutrient solution at a specific ratio, which further promotes the growth of Mesembryanthemum crystallinum and changes its taste. Meanwhile, the nutrient solution of Mesembryanthemum crystallinum has a high EC, which promotes the growth of Mesembryanthemum crystallinum. In this method, the step of separating seedlings is carried out at a reasonable time to ensure the quality of Mesembryanthemum crystallinum growth, and to fully utilize light energy and growth space.