Abstract: Provided is a method for producing a packing sheet with improved insulation and storage properties, the method including: producing a cell packing sheet by attaching together two overlapping films such that multiple cells are formed therebetween, by sealing second ends of the cells, and by disposing a check valve in an injection hole formed in a first end of each of the cells; inflating the cells by injecting a fluid through the respective check valves of the cells; attaching upper and lower films respectively to upper and lower sides of the cell packing sheet; cutting the cell packing sheet along a second edge thereof together with the upper and lower films such that the second ends of the sealed cells are opened; and sealing a second end of the upper film, a second end of the cell packing sheet, and a second end of the lower film.