The invention discloses an oil refining waste water catalytic ozonation pre-treatment apparatus and an oil refining waste water catalytic ozonation pre-treatment method and belongs to the technical field of oil refining waste water treatment. The apparatus includes, in a successively communicating manner, an ozone generating system, a catalytic ozonation column, an ozone tail gas reuse system and an ozone pre-oxidization column. The method includes following steps: (1) removing non-dissolved pollutants and degrading small-molecular organic pollutants by means of pre-oxidization of the oil refining waste water through ozone tail gas in the ozone pre-oxidization column; (2) catalytically oxidizing the oil refining waste water through high-concentration ozone in the catalytic ozonation column for degrading high-concentration large-molecular organic pollutants; and (3) recycling the tail gas from the catalytic ozonation column and providing the tail gas to the ozone pre-oxidization column by the ozone tail gas reuse system. By means of recycling of the ozone tail gas, the apparatus and the method can increase utilization rate of the ozone, can reduce cost of waste water treatment, can reduce pollutant load in the waste water and can improve biodegradability of discharged water. The method and the apparatus are simple in operation and easy to control.