The invention relates to a preparation or vitamin C calcium phosphate, including the following steps: weighing 50 to 100 weight parts of vitamin C and 1 to 5 weight parts of catalyzer, adding the sameto 100 to 200 weight parts of pure water, dissolving for 10min to 120min, controlling the temperature at 10 DEG C to 25 DEG C, adjusting the pH value of the solution to 7 to 12.5, and controlling thetemperature at 10 DEG C to 25 DEG C, adding 30 to 80 weight parts of sodium trimetaphosphate, adjusting the pH value to 7 to 12.5, etherifying at the temperature of 10 DEG C to 50 DEG C for 0.5h to 3h, adjusting the pH value to 9 to 12.5, reacting under the environment of 10 DEG C to 45 DEG C for 10h to 48h to produce the vitamin C calcium phosphate crude product, conducting the separate purifying process therefor to produce vitamin C calcium phosphate with more than 45% of effective vitamin C purity. The preparation has high conversion rate, simple operation and moderate reaction condition,is safe and environment friendly, can realize rapid reaction at the low temperature., and can be applied to the food additive such as bakeout, frying, instant noodles and the like, and pet and marinefeedstuff additive.