The invention relates to the technical field of water heaters, and specifically relates to a method for increasing the heat absorption rate of a solar water heater. The method is realized through thefollowing solar water heater. According to the method, dust on the outer wall of each heating pipe is removed simultaneously through a dusting mechanism, and then blockage for the outer walls of the heating pipes is reduced, so that the higher heat absorption efficiency of the heating pipes is achieved, and the heating effect is improved; water scale on the inner walls of the heating pipes can bescraped off, and washed away through water, so that the heat energy of the sunlight received by the heating pipes can be much effectively conducted into water, and the heating effect is further improved, and the method is safe, simple and convenient to operate; and the heating pipes can be covered with a protection plate to be protected while being not used by a user for a long time, and dust collection is avoided; and the protection plate can be lifted in summer, and the heat absorption amount of the heating pipes is reduced, so that the long-time high-temperature and high-pressure state in the heating pipes is avoided, and the service lives of the heating pipes are prolonged.