The cube ice machine is a kind of fully automatic edible ice machine, which adopts self-adjusting ice thickness, self-adjusting ambient temperature, automatic water replenishment, automatic ice formation and de-icing. The production process is fully automated, and the ice produced is uniform and beautiful, without the difference of thickness. The reasonable application of two patented technologies, flat wall heat exchange technology and circulating hot air de-icing technology, has solved many problems such as low production capacity, high power consumption and unstable de-icing of small ice machines.