The invention belongs to the technical field of quick-freezing processes for food, and particularly relates to a quick-freezing process for food. In the process, the food is immersed into liquid nitrogen for contact type freezing. The freezing implementation method of the quick-freezing process for food is simple, increases the efficiency of food freezing, reduces energy consumption in the process of food freezing, and increases the quality of frozen food. Equipment corresponding to the process is low in one-time investment, can be constructed in a short time, and occupies small floor area.