The invention discloses a high-altitude test clamp device specially for a transformer DC resistance test, which comprises a handheld rod, an extension rod and a clamp, wherein the clamp is connected onto the top end of the handheld rod; and the extension rod is movably connected with the bottom end of the handheld rod. A worker stands on the transformer to directly clamp the device on a casing lugwithout climbing the casing or using an overhead working truck, the working risks are reduced, manpower and material resources are saved, and the working efficiency is improved.