The invention relates to an ozone contact tank and an ozone contact method. The invention provide an ozone contact tank, comprising a water inlet passage, an aeration passage, a water-allocation area, a reaction area and a water outlet trough which are arranged in water inlet order and communicated in turn; a water outlet is arranged at the top of the water inlet passage, a water inlet is arranged at the top of the aeration passage, and the top of the water inlet passage is communicated with that of the aeration passage. The invention further provides an ozone contact method. The invention has the advantages that the aeration passage and the reaction area are separately arranged to avoid the influence of flow turbulence caused by the aeration to the hydraulic efficiency; the aeration passage is connected with the water-allocation are through a narrow passage to increase the uniform distribution of the ozone concentration in the water; a perforated plate and a water outlet weir are arranged so that the rising speed of the water flow in the reaction area is uniformly distributed to obtain a water flow state approaching to complete plug flow; therefore, the efficiency of disinfectionin the reaction area can be greatly improved.