Novel solar phase-change energy-storage water tank

The utility model relates to a solar phase-change energy-storage water tank, which comprises a shell, a heat exchange device, a water outlet pipe and a water inlet pipe. The shell is fixedly mounted on the periphery of the solar energy-storage water tank, the heat exchange device is arranged in the center of the solar energy-storage water tank and formed by overlaying single pieces, a fin and a single piece pipeline are arranged in each single piece and connected with each other, phase change materials are filled in the single pieces, and the water inlet pipe, the water outlet pipe and the single piece pipelines are connected in parallel in a reverse-return manner. The solar phase-change energy-storage water tank has the advantages that the solar phase-change energy-storage water tank solves the problems of poor heat exchange effect and low stability, increases energy storage density of the heat exchange device, guarantees heat exchange effect and effectively reduces initial investment.