An intelligent water-feeding and alarming device of a solar water heater belongs to the automatic control field. The device is composed of a single-chip microcomputer, a driver, an electromagnetic valve, an alarming device, a temperature sensor, and a temperature detecting circuit, etc. The device can automatically determine a proper water-feeding volume according to an input weather condition when water is fed into the solar water heater and then perform water feeding. The device can alarm and remind people so as to prevent dry burning in case of a low water level. Compared with the prior art, the device in the utility model can automatically determine a proper water feeding volume according to the weather conditions and then feed water to the solar water heater and further alarm people in case of a low water level.