Water tank for solar water heater

The invention relates to a water tank for a solar water heater, which comprises a heat insulation tank body, a cylindrical enamel water tank arranged in the tank body, a row of heat pipe evacuated tubes connected with the wall surface of the bottom of the water tank, a water inlet pipe and a water outlet pipe respectively arranged on both ends of the bottom of the water tank, wherein the water outlet of the water inlet pipe is lower than the water inlet of the water outlet pipe; the water tank is characterized in that: a pipe heat exchanger is arranged in the water tank, one end of the heat exchanger is the air inlet pipe and the other end is the air outlet pipe, the inlet of the air inlet pipe is connected with an air blower, the outlet of the air outlet pipe is communicated with atmosphere; a temperature control system for monitoring temperature is also arranged in the water tank and is connected with the air blower; the heat pipe evacuated tubes are obliquely connected with the bottom of the water tank. Wh