The utility model relates to a solar water heater capable of rotating 180 degrees. The solar water heater capable of rotating 180 degrees comprises a water tank and a vacuum glass tube. The vacuum glass tube is mounted on a heat collection panel. The two sides of the heat collection panel are provided with headers connected with the water tank through a hose. The heat collection panel is mounted and fixed through a swing bearing. The tail end of the heat collection panel is provided with a rolling wheel. The rolling wheel is connected with and fixed to the tail end of the heat collection panel through a U-shaped connecting rod. The rolling wheel is hinged to the U-shaped connecting rod. The solar water heater capable of rotating 180 degrees has the advantages that since a light sensor is arranged, the solar water heater can follow the direct solar radiation angle through manual control or through the light sensor, a circular track and a slide rail at the tail end of the heat collection panel are matched with each other and rotate, and a solar panel can convert solar energy into electric energy and store the electric energy into a storage battery for maintaining normal operation of the light sensor; a part of the electric energy converted by the solar panel is used for providing enough power for the light sensor, and the electric energy converted by the solar panel can also be used for supplying power to an electric heating wire in the water tank for heating water on cloudy and rainy days, so hot water can be obtained on the cloudy and rainy days.