NOVELTY - Chromium-rich instant spirulina preparation, involves: (1) preparing spirulina phycocyanin solution; (2) cultivating spirulina; (3) preparing instant commodity.    USE - The method is useful for preparing chromium-rich instant spirulina (claimed).    ADVANTAGE - The entire method, from spiral algae strain selection is carried out to the oral chrome-rich instant spiral algae is obtained, causes no pollution. The obtained spiral algae product is rich in trivalent chrome, such that the product can be taken as has a hypoglycemic health-care product.    DETAILED DESCRIPTION - Preparation of chromium-rich instant spirulina, involves: (1) preparing spirulina phycocyanin solution: (1.1) preparing culture medium according to the following components and proportions: taking 1 kg and 50-60 mg equivalent per L of water; sterilizing at 118-125 degrees C for 19-21 minutes, adding 0.5-0.7 g of sodium chloride, 0.3-0.4 g of potassium chloride, 0.006-0.008 g of calcium chloride, 1.8-1.98 g of sodium nitrate, 0.004-0.006 g of ferrous sulfate, 0.2-0.3 g of potassium sulfate, 0.05-0.06 g of magnesium sulfate, 14-14.2 g of sodium bicarbonate, 0.6-0.68 g of potassium and 0.02 g of sodium selenite to water, mixing uniformly to obtain culture medium; (1.2) preparing spirulina phycocyanin a liquid according to the following method: taking the workpiece in the step (1.1); then adding 10 ml of pure spirulina phycocyanin body placed in culture bottle, culturing for 13-15 days, in the culture tank, and then adding 25 kg of culture medium, culturing for 13-15 days to obtain the spirulina phycocyanin liquid at the temperature of 25-28 degrees C; (2) cultivating spirulina; (2.1) preparing nutritious liquid according to the following components and proportion: taking 700 kg and 50-60 mg equivalents per L of water, adding 60-70 g of sodium chloride, 160-190 g of potassium chloride, 4.2-4.5 g of chloride, 130-140 g of sodium nitrate, 2-3 g of ferrous sulfate, 300-500 g of potassium sulfate, 50-70 g of magnesium sulfate, 600-800 g of sodium bicarbonate, 180-210 g of potassium, 0.003-0.005 g of zinc sulfate, 0.5-0.6 g of diethyldithiocarbamate, 0.002-0.003 g of lanthanum chloride, 1.2-1.4 g of triphosphate, 0.8-0.9 g of sodium hexametaphosphate and 0.11-0.13 g of sodium selenite into water; after uniformly mixing in placed in culturing pond, and then adding 30-35 kg of fresh grass humic solution added in culturing pond, uniformly mixing to obtain the nutrient solution; (2.2) adding 25 kg spirulina phycocyanin according to each 700 nutrient solution for liquid, the A liquid nutrient solution for spirulina phycocyanin and placed in culturing pond, culturing pond is placed on greenhouse enough light, the temperature in the greenhouse is controlled at 20 degrees C to -35 degrees C, the relative humidity is 65%, continuously separate propagation, after 45 days to collecting spirulina; (3) preparing instant commodity; (3.1): adding collected fresh spirulina with 0.1-0.15 g of lysozyme, 0.15-0.2 g of Vc sodium, mixing uniformly to obtain semi-finished product spirulina; (3.2) placing the semi-finished product of spirulina into the cooling grid, putting the cooling nut in 38-42 degrees C of room, drying at 38-42 degrees C for 11-13 hours; (3.3) putting the dried spirulina after sterilizing in vacuum bag to form the chromium-rich instant spirulina.