Cold water storage device

The utility model belongs to the technical field of storage devices, and particularly relates to a cold water storage device which comprises a first reservoir. A second water storage tank is arranged on one side of the first water storage tank, the first water storage tank and the second water storage tank are connected through a connecting pipe, a protective sleeve is fixedly installed on the face, close to the connecting pipe, of the first water storage tank, and the protective sleeve covers the connecting pipe; the protective sleeve is mounted at the joint of the first reservoir and the connecting pipe, so that the protective sleeve covers the joint of the connecting pipe, and meanwhile, the heat insulation cotton covers the joint of the connecting pipe and the first reservoir, so that external hot air is effectively isolated, and the temperature difference between the inside and outside of the joint of the connecting pipe and the first reservoir is small; and through the designed structure, the situation