The invention relates to an atmospheric corrosion exposure test device for metal test samples. The device comprises a base fixing bracket (1), two inclined beams (3), a plurality of cross beams (4), two back vertical beams (8) and an atmospheric corrosion detector mounting box (2). One ends of the two inclined beams are separately mounted at two ends of a rotatable shaft (7) at the front end of the upper portion of the fixing bracket while the other ends are separately mounted on the two back vertical beams; the plurality of cross beams are parallelly and vertically mounted on the two inclinedbeams separately; the cross beams are divided into upper and lower regions; metal test samples (5) are symmetrically placed in the upper and lower regions separately; an atmosphere temperature/humidity inductor is mounted in the lower region, and an atmospheric corrosion detector monitors, records and stores couple corrosion currents and atmosphere temperature/humidity of special metal test samples. The device can analyze the relationship between atmospheric metal galvanic corrosion and lighting angle by means of corrosion weight loss, corrosion products, corrosion morphology, corrosion current and the like of the metal test samples in the regions at different angles.