Disclosed is a method for preparing nanometic particle of calcium carbonate, including the following steps: add form the crystal core to be accelerating agentinto uspension of calcium hydroxide in which blow into carbon dioxide, then add dispersing agentand water solution of enveloping agent, finally, filter the suspension of calcium carbonate after packaging and then dry it, acquiring the products of cubic nanometic size active calcium carbonate whose particle size and distribution can be controlled. The cubic calcium carbonate particle acquire has its diameter among the range of 12~100nm and controllable distribution, adjustable specific surface between 18~60m2/g, value of oil absorption number is smaller than 40g Dop/100g and without unit between them, which can be widely used in coating, PVC fusing gum for auto, rubber, plastic, seal rubber and so on as functional addition, making the products have high performance and additive value .