Packaging box for prolonging preservation time of fresh cut flowers

The utility model discloses a packing box for prolonging the shelf life of fresh cut flowers, which comprises a packing box body and a visual window, the bottom end of the packing box body is provided with a bottom box, the outside of the bottom box is provided with a protective shell, and the inside of the protective shell is provided with a water changing assembly for conveniently changing water inside the packing box body. The water changing assembly comprises a water storage tank, a small water pump, a first conveying pipe, a liquid adding pipe, a sewage tank and a second conveying pipe, the small water pump is installed in the water storage tank, the first conveying pipe is arranged at the left end of the small water pump, the liquid adding pipe is installed on the surface of the rear end of the water storage tank, and the sewage tank is arranged on the right side in the bottom tank. A second conveying pipe is installed at the right end of the sewage tank, and the visual window is located on the surface