A disinfectant supply device according to an exemplary embodiment of the present invention comprises: a power generator which receives and discharges natural water received in a water reservoir to generate power; a decelerator unit which is connected to the power generator to reduce a rotational force generated from the power generator; a supply control unit which is connected to the decelerator unit to control the rotational force reduced by the decelerator; and a chemical supply unit which is connected to the supply control unit, and is driven by the rotational force controlled by the supply control unit to supply a disinfectant to the water reservoir, wherein according to the rotational force controlled by the supply control unit, an amount of the disinfectant being supplied from the chemical supply unit is controlled. Such a disinfectant supply device controls the supplying amount of a disinfectant, depending on a contamination level or a water level of natural water, and changes in bacterial propagation due to seasonal temperature differences; supplies the disinfectant in an appropriate amount, thereby reducing the amount of disinfectant used and preventing the environmental pollution; supplies drinking water harmless to a human body; and can be operated conveniently even by non-professional users, and thus malfunctions can be reduced.;COPYRIGHT KIPO 2018
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