Portable sample quick-freezing cold closet

The invention provides a portable sample quick-freezing cold closet. The quick-freezing cold closet comprises a box body and an anti-freezing hose, wherein the box body comprises an outer box body andan inner box body, and the inner box body is arranged in the outer box body; the outer box body is characterized in that the outer box body is further provided with a liquid nitrogen device, and theliquid nitrogen device is arranged beside the inner box body; heat preservation layers and waterproof layers are arranged on box walls of the inner box body, wherein the waterproof layers each are symmetrically arranged on the two sides of the heat preservation layers each; an inner box cover is sequentially provided with a metal layer, one of the heat preservation layers, one of the waterproof layers and a first hollow interlayer, a second hollow interlayer is further arranged on the bottom surface of the box body, and the liquid nitrogen device communicates with the first hollow interlayer and the second hollow inter