The present invention is achieved by a constant sterilization system for an underground water tube well, comprising: a gas-liquid mixing device provided with a mixture supply part into which a mixture of water and ozone gas is injected, a main body forming the outer appearance, a first spray part on the inside of the main body and supplied with the mixture from the mixture supply part so as to spray the same, a foam generation part generates bubbles by spraying the mixture from the first spray part, an ozone water generation part provided with one or more second spray parts for converting the bubbles generated through the bubble generation part into ozone water, spraying the converted ozone water at the inside surface of the main body, and increasing the internal pressure of the main body, and a discharge part discharging the ozone water sprayed through the second spray parts to the main body an ozone gas supply part for supplying ozone gas to the gas-liquid mixing device and a discharge pump for pumping up underground water or supplying the underground water to the gas-liquid mixing device, wherein the ozone water generated in the gas-liquid mixing device is supplied to a tube well so as to sterilize the germs of the underground water. Therefore, the inhabitation of germs in the tube well can be prevented.Linvention concerne un système de stérilisation constante de puits tubulaire pour eaux souterraines, ledit système comprenant : un dispositif de mélange gaz-liquide équipé dune partie dalimentation en mélange dans laquelle est injecté un mélange deau et dozone gazeux, un corps principal formant laspect extérieur, une première partie de pulvérisation située à lintérieur du corps principal et alimentée par le mélange obtenu dans la partie dalimentation en mélange afin de pulvériser ledit mélange, une partie génératrice de mousse qui produit des bulles en pulvérisant le mélange sortant de la première partie de pulvérisation, une partie génératrice deau traitée par lo
