The invention relates to oxidation resistant fruit juice and a preparation method thereof. The oxidation resistant fruit juice is prepared from the following raw material components in parts by weight: 1-20 parts of concentrated blueberry juice, 10-80 parts of hippophae rhamnoides juice, 0.01-0.03 part of citric acid, 0.005-0.01 part of citrate and 0.0002-0.0004 part of sodium benzoate. The preparation method comprises the following steps of mixing the concentrated blueberry juice, the hippophae rhamnoides juice, a citric acid solution, a citrate solution and a sodium benzoate solution, performing homogenizing, performing canning, and performing microwave sterilization so as to obtain a target product. Compared with the prior art, the oxidation resistant fruit juice and the preparation method thereof disclosed by the invention have the advantages that the content of oxidation resistant components of the oxidation resistant fruit juice is high, the preserving stability is good, and the preparation technology is simple.