The invention provides an atmospheric exposure environment test corrosion coupon clamp and belongs to the technical field of natural environment test devices. The clamp structurally comprises a base,an upright post on the base, a connecting part and a top cover, wherein the base is insulated from the upright post, the upright post is cylindrical and is positioned in the center of an upper surfaceof the base, the top cover is insulated, the bottom of the top cover is hollow corresponding to the upright post, a screw rod is fixedly connected in the base, extends out of the center of a lower surface of the base, and is matched with a nut to be fixed on an exposure rack sample fixing batten, the base and the top cover are connected through an elastic contraction part or are in threaded connection through an outer extension end of the screw rod in the base in the other direction, and protrusions with uniform sizes are distributed on a contact surface of the base and the top cover in a staggered mode. The clamp is advantaged in that the clamp is simple in structure, convenient to operate and capable of stably clamping corrosion hanging pieces with different thicknesses, meanwhile, thedesign of the convex points effectively reduces the contact area of the clamp and the corrosion hanging piece and avoids crevice corrosion.