Instant freezer and control method thereof

The invention discloses an instant freezer and a control method of the instant freezer. The instant freezer comprises a plurality of function rooms, a conveying belt for conveying articles to penetrate through the function rooms and a refrigerating unit. The plurality of functional rooms comprise a pre-cooling room and a quick-freezing room, the pre-cooling room is communicated with the quick-freezing room, a quick-freezing air cooler is mounted in the quick-freezing room, and outlet air of the quick-freezing room is sent back to the quick-freezing room through the pre-cooling room; the pre-cooling room is divided into at least two pre-cooling chambers, each pre-cooling chamber is provided with a pre-cooling air cooler capable of working independently, when the instant freezer is in a refrigeration state, the pre-cooling air cooler of at least one pre-cooling chamber operates in a refrigeration mode, and an air inlet and an air outlet of each pre-cooling chamber are opened. The air fed into the quick-freezing