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This invention provides a method for preparing 2,5-furandicarboxylic acid in an acidic system, belonging to the field of bio-based chemical preparation. It is a method for synthesizing 2,5-furandicarboxylic acid by catalytic oxidation of 2,5-diformylfuran in an acidic environment. The method uses 2,5-diformylfuran as a raw material and employs an aqueous / organic two-phase catalytic system, using hydrogen peroxide to oxidize 2,5-diformylfuran to prepare 2,5-furandicarboxylic acid. In this invention, the raw material 2,5-diformylfuran and the catalyst are dissolved in the organic phase, the aqueous phase is acidic, and the oxidation product 2,5-furandicarboxylic acid precipitates in the aqueous phase. High-purity 2,5-furandicarboxylic acid can be obtained by simple filtration. The catalyst in the organic phase can be recycled multiple times. This invention does not use precious metal catalysts, does not require the addition of additional inorganic bases before or after the reaction, has simple product separation, generates little waste, and has broad application prospects.