The invention relates to an automatic cleaning device for a 
solar water heater. The automatic cleaning device for the 
solar water heater comprises a trolley, a distribution box, a circulating water tank, a steam water tank, a circulating water pump, a steam water pump, an 
electric heating evaporator, an electromagnetic descaling device, a trailer, a 
drying air pipeline, a steam pipeline, a constant-pressure 
exhaust valve, a filter, an air extracting pump, an electric heater and a connecting 
pipe. According to the automatic cleaning device for the 
solar water heater, the electromagnetic descaling technology is adopted, safety and high efficiency are achieved, 
corrosion for the 
water heater and damage to 
human body due to 
reagent residue after descaling of a traditional chemical 
reagent are avoided; and meanwhile, high-pressure steam is adopted to clean the surface of a heat collecting 
pipe, and 
drying with hot air is conducted; and the 
thermal decomposition function of steam is adopted, the sticky property of 
sediment and 
stain is quickly dissolved, so that the 
sediment and 
stain are separated from the heat collecting 
pipe, 
water consumption is reduced, and the surface of the heat collecting pipe is not damaged.