Heat-preservation water tank of solar water heater

The invention provides a heat-preservation water tank of a solar water heater. The water tank comprises a water tank liner, a heat-preservation layer and a water tank shell, the heat-preservation layer comprises an inner heat-preservation layer body and an outer heat-preservation layer body, the inner heat-preservation layer body is arranged on the inner surface of the water tank liner, the outer heat-preservation layer body is arranged on the outer surface of the water tank liner, the water tank shell wraps the outer heat-preservation layer body, and the inner heat-preservation layer body is made of acrylate and polyether polyol mixed foam. According to the heat-preservation water tank, a temperature controller is added, and the inner heat-preservation layer body made of the acrylate and polyether polyol mixed foam is added to the water tank liner, so that problems that a heat-preservation water tank of a solar water heater is poor in temperature control effect and heat preservation effect are effectively solved, and the service life of the water tank is prolonged.