Water-saving device of solar water heater

The utility model relates to a water-saving device of a solar water heater, which belongs to the technical field of a water heater. The water-saving device comprises a water storage tank and a water storage leather bag, wherein the water storage tank is divided into two parts by a clapboard; the water storage leather bag is arranged at the lower part of the water storage tank and is connected with a water inlet pipe and a water outlet pipe respectively; a pressure storage air bag is arranged at the upper part of the water storage tank, a cover plate is arranged on the pressure storage air bag, and the pressure storage air bag is connected with an air pump and an electromagnetic throttle valve respectively; a limit block is arranged at the upper end of the side surface of the water storage tank; a normally-closed electromagnetic valve is arranged on the water inlet pipe and is connected with a water outlet pipe of the solar heater by a three-way pipe; two temperature sensors are arranged on the water outlet pipe of the solar heater, wherein one temperature sensor is electrically connected with a temperature controller, and the temperature controller is electrically connected with the normally-closed electromagnetic valve and a bell; an electromagnetic valve and a one-way valve are arranged on the water outlet pipe of the water-saving device and are connected with the water outlet pipe of the water heater; and the other temperature sensor is electrically connected with a temperature controller, and the temperature controller is electrically connected with the electromagnetic valve, the air pump and the electromagnetic throttle valve respectively. The water-saving device can collect cold water in the water outlet pipe of the solar water heater, thereby avoiding water waste.