The invention relates to a
quick freezing method and device for agricultural and pastoral fresh products, and belongs to the technical field of
quick freezing of agricultural and pastoral products. The device is mainly composed of a self-pressurization Dewar tank, a
liquid nitrogen collecting box, a
freezing chamber, a heat preservation chamber, a tubular
ultraviolet sterilization lamp, a temperature sensor, a rotating rack, a control console and the like. Firstly, agricultural and pastoral fresh products are fixed to a rotary rack; the self-pressurization Dewar tank is opened, so that
liquid nitrogen enters the
liquid nitrogen collection box; liquid
nitrogen is gasified and pumped to a
freezing chamber by a large directional fan at the top of the liquid
nitrogen collecting box; in the whole process, the transmission device drives the rotating rack to rotate at a certain speed, so that agricultural and pastoral products are fully and uniformly frozen. Meanwhile, a tubular
ultraviolet sterilizing lamp on the inner wall of the
freezing chamber sterilizes and disinfects agricultural and pastoral products, and finally condensate water and
biological waste liquid in the agricultural and pastoral products are recycled through a waste liquid collecting box at the bottom of the freezing chamber. The defects that a traditional compressor is high in
refrigeration energy consumption, long in
refrigeration time, low in efficiency, poor in fresh-keeping degree and the like are overcome.