The present invention relates to an ozone on-line injection, recovering and eradicating system. It is characterized by utilizing a liquid which can be drawn by pump and can be used for mixing with ozone, and said system mainly includes a gas-liquid separation device and an ozone eradicating device. After the ozone and pump-drawn liquid are mixed, the partial ozone can be dissolved in the liquid, and the non-dissolved portion can be recovered and reutilized, and the ozone which can not be recovered and reutilized, oxygen gas and nitrogen gas can be introduced into an ozone eradicating device in which an ozone eradicating agent is contained and can be used for making the ozone be decomposed into oxygen gas. |