The invention relates to the field of food seasonings, in particular to mesembryanthemum crystallinum plant salt and a preparation technology thereof. Mesembryanthemum crystallinum whole plants, leaves and stems are picked to serve as raw materials, screening, cleaning, pulping, concentration, centrifugation, membrane filtration, crystallization and recrystallization are conducted in sequence, and the mesembryanthemum crystallinum plant salt is obtained. The mesembryanthemum crystallinum plant salt is prepared from 55-75% of sodium, 20-30% of potassium, 0.2-2% of calcium, 0.3-3% of magnesium, 0-10% of protein, 0-15% of total sugar and smaller than or equal to 1% of other mineral elements. Accordingly, advanced extraction and crystallization technologies are combined, the formed biogenetic salt is green crystals, carbohydrate in a product is low, in the crystallization process, the carbohydrate can be crystallized into the crystals by selecting a specific solvent for corresponding embedding, the product property is stable, moisture absorption is not likely to occur, and the quality guarantee period of the product is long.