The invention provides a nitrogen-oxygen separation carrier phenolic foam product and a preparation method thereof. The nitrogen-oxygen separation carrier phenolic foam product comprises, by mass, 100parts of a high-performance phenolic resin, 20-35 parts of a curing agent, 5-15 parts of a foaming agent, 5-15 parts of a wetting agent, 3-6 parts of a cell opener, 2.5-3.5 parts of ethanol, 1-1.5 parts of butanol and 0.1-0.5 part of sodium butoxide, wherein the curing agent is a mixture of deionized water, phosphoric acid and p-toluenesulfonic acid, and a ratio of the deionized water to the phosphoric acid to the p-toluenesulfonic acid is 37:37:100. Compared with products on the market at present, the nitrogen-oxygen separation carrier phenolic foam product prepared in the invention has theadvantages of low ash content, high aperture ratio, strong water absorption, facilitation of the preparation of a nitrogen-oxygen separation carrier with volatile components, and increase of the nitrogen production concentration and the nitrogen production rate.