Self-stacking spiral freezer incorporate interlocking self-stacking belt, which tier by tier stacks on robust chain-ball driving system, completed with wire belt mesh and self-supporting side links, belt stack forms special ducting and enclosed freezing zone and works as circulation loop. Controlled cold air travels around food products while circulating through belt stack from the top down, high heat exchange minimizes freezing time and dehydration, achieves maximum throughput in minimal footprint.