Ozone adding system and liquid ozone adding method

The invention discloses an ozone adding system and a liquid ozone adding method. The ozone adding system comprises a water inlet pipeline, an ozone tank, a water outlet pipeline and a circulating pipeline, the water inlet pipeline and the water outlet pipeline are respectively connected with the ozone tank; one end of the circulating pipeline is connected with the water outlet pipeline, and the other end of the circulating pipeline is connected with the water inlet pipeline and the ozone tank; a centrifugal pump is arranged on the water outlet pipeline; a circulating pump is arranged on the circulating pipeline; and a respirator is arranged on the ozone tank. The defects that in the prior art, when ozone is added into liquid through the ozone adding system and conveyed to a filling machineto be filled, the liquid level in a packaging container is unstable, and the liquid level height is not easy to control are overcome, the stability of the liquid level in the packaging container canbe guaranteed, and the liq