The invention discloses an atmospheric-corrosion exposure frame which comprises a corrosion-resistant square frame main body and a corrosion-resistant base detachably fixed with the frame main body, wherein the frame main body comprises two upright beams and a plurality of cross beams, and the two ends of each cross beam are respectively fixed on the upright beams; at least one upright beam sliding groove is formed in each upright beam, and the end parts of each cross beam are mounted in the upright beam sliding grooves; cross beam grooves are formed in the two sides of each cross beam, a sample placing gap is formed between every two adjacent cross beam, and a plurality of metal samples are clamped in the sample placing gap. As the upright beam sliding grooves are formed in the upright beams, the cross beams can slide on the upright beams, the distance among the cross beams is adjusted so as to adapt to the metal samples with different sizes. In addition, as the cross beam grooves are formed in the cross beams, the two ends of each metal sample are clamped in the cross beam grooves, the metal sample does not need an additive sample clamp to be fixed, and the clamping operation is convenient and simple.