The invention relates to a method for making
fresh water by fan-shaped foldable
sea ice storage devices. Each fan-shaped foldable
sea ice storage device is characterized by comprising a bottom cabin plate and four
enclosure cabin plates, wherein each
enclosure cabin plate is in the shape of an
isosceles trapezoid, the bottom cabin plate is in the shape of a square, and the
enclosure cabin plates are hinged with the bottom cabin; the contact periphery of the enclosure cabin plates and the bottom cabin is provided with a sealing
gasket; the enclosure cabin plates are provided with synchronous folding strips, and the enclosure cabin plates and bottom cabin plate are respectively provided with a float bowl; a plurality of devices are put on the sea in a planar mode, and
seawater in the enclosure cabin plates and bottom cabin plate becomes ice when the
air temperature is lower than 0 DEG C; when the
air temperature rises, the
sea ice starts to melt; when the
seawater is sucked into the float bowl of the bottom cabin plate, the bottom cabin plate sinks, and the enclosure cabin plates are synchronously folded towards the center under the guide of the synchronous folding strips to form a container; when the
seawater in the container is evacuated, self-reinforced seal of the container is formed under the pressure of the outside seawater; and when the sea ice in the container melts, the
fresh water is obtained. The invention does not occupy the
land resources; the devices are foldable, thereby reducing the occupied area on the sea surface; and the invention saves the procedure of dredging and transporting ice, thereby saving abundant human and energy sources.