The utility model discloses a gas ascent type outer cyclic bubbling oxidation tower apparatus used for the production of terephthalic acid. The apparatus comprises a cylinder type bubbling tower with top expanding section, an outer cycle pipe, a gas distributor, a liquid return distributor and a condenser. An upper mouth and a lower mouth of the outer cycle pipe are respectively communicated with an upper part and a lower part of the bubbling tower reaction section. A pulp of the upper of the tower leads to the lower zone of the tower through the outer cycle pipe by the action of the gas ascent, forming the fluid to cycle in the whole tower and catalyzing and oxidating a p-xylene liquid. The bubbling tower utilizes the larger ratio of high diameter to strengthen the gas-liquid mass transfer and the gas ascent type outer cycle pipe to improve the distribution of the temperature and the concentration in the tower. Because the utility model adopts the tower without any moving part, the utility model has simple structure, low production and transportation cost and at the same time is applied for the catalysis and oxidation of the p-xylene gas liquid under various reaction conditions in all aspects of the reaction, mass transfer, mixing, and heating to meet the demands of the different technology devices for the terephthalic acid.