Solar water heater using outdoor cement court

The invention discloses a solar water heater using an outdoor cement court. The solar water heater comprises a circulating metal pipe, a heat pump system and a water storage tank, wherein the circulating metal pipe is inlaid in a cement floor of the outdoor cement court, is used for circulating cold water and can collect solar radiation energy so that the cold water can absorb the solar radiation energy; the heat pump system is connected with the circulating metal pipe and is used for performing thermal conversion on the solar radiation energy absorbed by the cold water; and the water storage tank is connected with the heat pump system and is used for storing water heated by a heat pump. The circulating metal pipe is arranged in the cement floor of the outdoor cement court, and is not in direct contact with soil; and because the soil texture of the cement floor cannot be changed by changing of a thermal environment in the cement floor, soil under the cement floor cannot be polluted, and the efficiency is high.