The technological method for preparing dry ice includes the following steps: firstly, putting carbon dioxide into a container, then putting it into a cooling chamber for preliminary pre-cooling treatment, wherein the pre-cooling temperature is-10-20 DEG C, and standing for10-20 minutes, and then entering a forced refrigeration room for forced refrigeration at-80 DEG C-1. The dry ice made by this method has high density, good compactness, crystal color and long volatilization time, and can be used in the production of various beverages and the cleaning project of dry ice.

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1. A preparation process of crystalline dry ice is characterized in that the preparation process of crystalline dry ice is as follows: (1), firstly, liquid carbon dioxide is injected into a special container with forced fins outside the container, which has good heat dissipation performance; (2) putting a container filled with carbon dioxide into a primary cooling chamber for pre-cooling, wherein the pre-cooling temperature is-10-20 DEG C, and standing for10-20 minutes; (3) cooling the cooled carbon dioxide at-80℃-120℃ for 20-30 minutes; (4) after cooling, making crystalline dry ice in a container; (5) entering a demoulding chamber, and performing micro-thermal demoulding; (6) After demoulding, high-density crystalline dry ice is obtained.